– Supports PCI Power Management Interface specification,
Revision 1.1 (PCI-PM)
•
Supports powerdown modes at the link level (L0, L0s, L1,
L2/L3 Ready and L3) and at the device level (D0, D3
hot
)
– Unused SerDes disabled
◆
Testability and Debug Features
– Built in SerDes Pseudo-Random Bit Stream (PRBS) generator
– Ability to read and write any internal register via the SMBus
– Ability to bypass link training and force any link into any mode
– Provides statistics and performance counters
◆
Thirty-two General Purpose Input/Output pins
– Each pin may be individually configured as an input or output
– Each pin may be individually configured as an interrupt input
– Some pins have selectable alternate functions
◆
Packaged in a 23mm x 23mm 484-ball Flip Chip BGA with
1mm ball spacing
Product Description
Utilizing standard PCI Express interconnect, the PES22H16 provides
the most efficient I/O connectivity for applications requiring high
throughput, low latency, and simple board layout with a minimum
number of board layers. It provides 88 Gbps of aggregated, full-duplex
switching capacity through 22 integrated serial lanes, using proven and
robust IDT technology. Each lane provides 2.5 Gbps of bandwidth in
both directions and is fully compliant with PCI Express Base specifica-
tion 1.1.
The PES22H16 is based on a flexible and efficient layered architec-
ture. The PCI Express layer consists of SerDes, Physical, Data Link and
Transaction layers. The PES22H16 can operate either as a store and
forward switch or a cut-through switch and is designed to switch memory
and I/O transactions. It supports eight Traffic Classes (TCs) and two
Virtual Channels (VCs) with sophisticated resource management to
enable efficient switching and I/O connectivity.
SMBus Interface
The PES22H16 contains two SMBus interfaces. The slave interface
provides full access to the configuration registers in the PES22H16,
allowing every configuration register in the device to be read or written
by an external agent. The master interface allows the default configura-
tion register values of the PES22H16 to be overridden following a reset
with values programmed in an external serial EEPROM. The master
interface is also used by an external Hot-Plug I/O expander.
Six pins make up each of the two SMBus interfaces. These pins
consist of an SMBus clock pin, an SMBus data pin, and 4 SMBus
address pins. In the slave interface, these address pins allow the
SMBus address to which the device responds to be configured. In the
master interface, these address pins allow the SMBus address of the
serial configuration EEPROM from which data is loaded to be config-
ured. The SMBus address is set up on negation of PERSTN by
sampling the corresponding address pins. When the pins are sampled,
the resulting address is assigned as shown in Table 1.
Bit
1
2
3
4
5
6
7
Slave
SMBus
Address
SSMBADDR[1]
SSMBADDR[2]
SSMBADDR[3]
0
SSMBADDR[5]
1
1
Master
SMBus
Address
MSMBADDR[1]
MSMBADDR[2]
MSMBADDR[3]
MSMBADDR[4]
1
0
1
Table 1 Master and Slave SMBus Address Assignment
As shown in Figure 3, the master and slave SMBuses may be used
in a unified or split configuration. In the unified configuration, shown in
Figure 3(a), the master and slave SMBuses are tied together and the
PES22H16 acts both as a SMBus master as well as a SMBus slave on
this bus. This requires that the SMBus master or processor that has
access to PES22H16 registers supports SMBus arbitration. In some
systems, this SMBus master interface may be implemented using
general purpose I/O pins on a processor or micro controller, and may
not support SMBus arbitration. To support these systems, the
PES22H16 may be configured to operate in a split configuration as
shown in Figure 3(b).
In the split configuration, the master and slave SMBuses operate as
two independent buses and thus multi-master arbitration is never
required. The PES22H16 supports reading and writing of the serial
EEPROM on the master SMBus via the slave SMBus, allowing in
system programming of the serial EEPROM.
2 of 37
October 3, 2011
IDT 89HPES22H16 Data Sheet
PES22H16
Processor
SMBus
Master
Serial
EEPROM
...
Other
SMBus
Devices
PES22H16
Processor
SMBus
Master
...
Other
SMBus
Devices
SSMBCLK
SSMBDAT
MSMBCLK
MSMBDAT
SSMBCLK
SSMBDAT
MSMBCLK
MSMBDAT
Serial
EEPROM
(a) Unified Configuration and Management Bus
(b) Split Configuration and Management Buses
Figure 3 SMBus Interface Configuration Examples
Hot-Plug Interface
The PES22H16 supports PCI Express Hot-Plug on each downstream port (ports 1 through 15). To reduce the number of pins required on the
device, the PES22H16 utilizes an external I/O expander, such as that used on PC motherboards, connected to the SMBus master interface. Following
reset and configuration, whenever the state of a Hot-Plug output needs to be modified, the PES22H16 generates an SMBus transaction to the I/O
expander with the new value of all of the outputs. Whenever a Hot-Plug input changes, the I/O expander generates an interrupt which is received on
the IOEXPINTN input pin (alternate function of GPIO) of the PES22H16. In response to an I/O expander interrupt, the PES22H16 generates an
SMBus transaction to read the state of all of the Hot-Plug inputs from the I/O expander.
General Purpose Input/Output
The PES22H16 provides 32 General Purpose I/O (GPIO) pins that may be individually configured as general purpose inputs, general purpose
outputs, or alternate functions. Some GPIO pins are shared with other on-chip functions. These alternate functions may be enabled via software,
SMBus slave interface, or serial configuration EEPROM.
Pin Description
The following tables lists the functions of the pins provided on the PES22H16. Some of the functions listed may be multiplexed onto the same pin.
The active polarity of a signal is defined using a suffix. Signals ending with an “N” are defined as being active, or asserted, when at a logic zero (low)
level. All other signals (including clocks, buses, and select lines) will be interpreted as being active, or asserted, when at a logic one (high) level. Differ-
ential signals end with a suffix “N” or “P.” The differential signal ending in “P” is the positive portion of the differential pair and the differential signal
ending in “N” is the negative portion of the differential pair.
Signal
PE0RP[3:0]
PE0RN[3:0]
PE0TP[3:0]
PE0TN[3:0]
PE1RP[0]
PE1RN[0]
PE1TP[0]
PE1TN[0]
PE2RP[3:0]
PE2RN[3:0]
PE2TP[3:0]
PE2TN[3:0]
Type
I
O
I
O
I
O
Name/Description
PCI Express Port 0 Serial Data Receive.
Differential PCI Express receive pairs for
port 0. Port 0 is the upstream port.
PCI Express Port 0 Serial Data Transmit.
Differential PCI Express transmit pairs for
port 0. Port 0 is the upstream port.
PCI Express Port 1 Serial Data Receive.
Differential PCI Express receive pair for
port 1.
PCI Express Port 1 Serial Data Transmit.
Differential PCI Express transmit pair for
port 1.
PCI Express Port 2 Serial Data Receive.
Differential PCI Express receive pairs for
port 2.
PCI Express Port 2 Serial Data Transmit.
Differential PCI Express transmit pairs for
port 2.
Table 2 PCI Express Interface Pins (Part 1 of 3)
3 of 37
October 3, 2011
IDT 89HPES22H16 Data Sheet
Signal
PE3RP[0]
PE3RN[0]
PE3TP[0]
PE3TN[0]
PE4RP[0]
PE4RN[0]
PE4TP[0]
PE4TN[0]
PE5RP[0]
PE5RN[0]
PE5TP[0]
PE5TN[0]
PE6RP[0]
PE6RN[0]
PE6TP[0]
PE6TN[0]
PE7RP[0]
PE7RN[0]
PE7TP[0]
PE7TN[0]
PE8RP[0]
PE8RN[0]
PE8TP[0]
PE8TN[0]
PE9RP[0]
PE9RN[0]
PE9TP[[0]
PE9TN[0]
PE10RP[0]
PE10RN[0]
PE10TP[0]
PE10TN[0]
PE11RP[0]
PE11RN[0]
PE11TP[0]
PE11TN[0]
PE12RP[0]
PE12RN[0]
PE12TP[0]
PE12TN[0]
PE13RP[0]
PE13RN[0]
PE13TP[0]
PE13TN[0]
Type
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
Name/Description
PCI Express Port 3 Serial Data Receive.
Differential PCI Express receive pair for
port 3.
PCI Express Port 3 Serial Data Transmit.
Differential PCI Express transmit pair for
port 3.
PCI Express Port 4 Serial Data Receive.
Differential PCI Express receive pair for
port 4.
PCI Express Port 4 Serial Data Transmit.
Differential PCI Express transmit pair for
port 4.
PCI Express Port 5 Serial Data Receive.
Differential PCI Express receive pair for
port 5.
PCI Express Port 5 Serial Data Transmit.
Differential PCI Express transmit pair for
port 5.
PCI Express Port 6 Serial Data Receive.
Differential PCI Express receive pair for
port 6.
PCI Express Port 6 Serial Data Transmit.
Differential PCI Express transmit pair for
port 6.
PCI Express Port 7 Serial Data Receive.
Differential PCI Express receive pair for
port 7.
PCI Express Port 7 Serial Data Transmit.
Differential PCI Express transmit pair for
port 7.
PCI Express Port 8 Serial Data Receive.
Differential PCI Express receive pair for
port 8.
PCI Express Port 8 Serial Data Transmit.
Differential PCI Express transmit pair for
port 8.
PCI Express Port 9 Serial Data Receive.
Differential PCI Express receive pair for
port 9.
PCI Express Port 9 Serial Data Transmit.
Differential PCI Express transmit pair for
port 9.
PCI Express Port 10 Serial Data Receive.
Differential PCI Express receive pair for
port 10.
PCI Express Port 10 Serial Data Transmit.
Differential PCI Express transmit pair for
port 10.
PCI Express Port 11 Serial Data Receive.
Differential PCI Express receive pair for
port 11.
PCI Express Port 11 Serial Data Transmit.
Differential PCI Express transmit pair for
port 11.
PCI Express Port 12 Serial Data Receive.
Differential PCI Express receive pair for
port 12.
PCI Express Port 12 Serial Data Transmit.
Differential PCI Express transmit pair for
port 12.
PCI Express Port 13 Serial Data Receive.
Differential PCI Express receive pair for
port 13.
PCI Express Port 13 Serial Data Transmit.
Differential PCI Express transmit pair for
port 13. W
Table 2 PCI Express Interface Pins (Part 2 of 3)
4 of 37
October 3, 2011
IDT 89HPES22H16 Data Sheet
Signal
PE14RP[0]
PE14RN[0]
PE14TP[0]
PE14TN[0]
PE15RP[0]
PE15RN[0]
PE15TP[0]
PE15TN[0]
REFCLKM
Type
I
O
I
O
I
Name/Description
PCI Express Port 14 Serial Data Receive.
Differential PCI Express receive pair for
port 14.
PCI Express Port 14 Serial Data Transmit.
Differential PCI Express transmit pair for
port 14.
PCI Express Port 15 Serial Data Receive.
Differential PCI Express receive pair for
port 15.
PCI Express Port 15 Serial Data Transmit.
Differential PCI Express transmit pair for
port 15.
PCI Express Reference Clock Mode Select.
This signal selects the frequency of the
reference clock input.
0x0 - 100 MHz
0x1 - 125 MHz
PCI Express Reference Clock.
Differential reference clock pair input. This clock is
used as the reference clock by on-chip PLLs to generate the clocks required for the
system logic and on-chip SerDes. The frequency of the differential reference clock is
determined by the REFCLKM signal.
Table 2 PCI Express Interface Pins (Part 3 of 3)
PEREFCLKP[3:0]
PEREFCLKN[3:0]
I
Signal
MSMBADDR[4:1]
MSMBCLK
Type
I
I/O
Name/Description
Master SMBus Address.
These pins determine the SMBus address of the serial
EEPROM from which configuration information is loaded.
Master SMBus Clock.
This bidirectional signal is used to synchronize transfers on the
master SMBus. It is active and generating the clock only when the EEPROM or I/O
Expanders are being accessed.
Master SMBus Data.
This bidirectional signal is used for data on the master SMBus.
Slave SMBus Address.
These pins determine the SMBus address to which the slave
SMBus interface responds.
Slave SMBus Clock.
This bidirectional signal is used to synchronize transfers on the
slave SMBus.
Slave SMBus Data.
This bidirectional signal is used for data on the slave SMBus.
Table 3 SMBus Interface Pins
MSMBDAT
SSMBADDR[5,3:1]
SSMBCLK
SSMBDAT
I/O
I
I/O
I/O
Signal
GPIO[0]
GPIO[1]
GPIO[2]
GPIO[3]
Type
I/O
I/O
I/O
I/O
Name/Description
General Purpose I/O.
This pin can be configured as a general purpose I/O pin.
General Purpose I/O.
This pin can be configured as a general purpose I/O pin.
General Purpose I/O.
This pin can be configured as a general purpose I/O pin.
General Purpose I/O.
This pin can be configured as a general purpose I/O pin.
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