Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
FEBRUARY 2009
DSC-6358/6
IDT72T6480 2.5V, SEQUENTIAL FLOW-CONTROL DEVICE
x12, x24, x48 BIT WIDE CONFIGURATION
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
Table of Contents
Features ......................................................................................................................................................................................................................... 1
- Control and Feature Interface ............................................................................................................................................................................ 8
- Power and Ground Signals ............................................................................................................................................................................. 10
- Pin Number Location Table .............................................................................................................................................................................. 10
Signal Descriptions ........................................................................................................................................................................................................ 23
AC Test Conditions ........................................................................................................................................................................................................ 29
AC Electrical Characteristics ........................................................................................................................................................................................... 30
Ordering Information ...................................................................................................................................................................................................... 51
Table 3 – Total Possible External Memory Configurations ............................................................................................................................................... 12
Table 5 – Total useable memory based on various configurations ................................................................................................................................... 18
Table 6 – IDT72T6480 Maximum Frequency Based on 166MHz DDR SDRAM ............................................................................................................ 19
Table 7 – IDT72T6480 Maximum Frequency Based on 133MHz DDR SDRAM ............................................................................................................ 19
Table 11– Default Programmable Flag Offsets ................................................................................................................................................................. 22
Table 12– Number of Bits Required for Offset Registers .................................................................................................................................................. 22
Figure 5a. AC Test Load ................................................................................................................................................................................................ 29
Figure 8. Write First Word Cycles - IDT Standard Mode ................................................................................................................................................. 34
Figure 9. Write First Word Cycles - FWFT Mode ............................................................................................................................................................ 34
Figure 10. Empty Boundary - IDT Standard Mode ........................................................................................................................................................ 35
Figure 12. Full Boundary - IDT Standard Mode ............................................................................................................................................................ 36
Figure 13. Full Boundary - FWFT Mode ....................................................................................................................................................................... 36
Figure 17. Bus-Matching Configuration - x48 In to x24 Out - IDT Standard Mode .......................................................................................................... 38
Figure 18. Bus-Matching Configuration - x48 In to x12 Out - IDT Standard Mode .......................................................................................................... 38
Figure 19. Bus-Matching Configuration - x24 In to x48 Out - IDT Standard Mode .......................................................................................................... 39
Figure 20. Bus-Matching Configuration - x12 In to x48 Out - IDT Standard Mode .......................................................................................................... 39
Figure 21. Synchronous
PAE
Flag - IDT Standard Mode and FWFT Mode ................................................................................................................... 40
Figure 22. Synchronous
PAF
Flag - IDT Standard Mode and FWFT Mode ................................................................................................................... 40
Figure 23. Asynchronous Read and PAF Flag - IDT Standard Mode ............................................................................................................................. 41
Figure 24. Asynchronous Write and PAE Flag - IDT Standard Mode .............................................................................................................................. 41
Figure 25. Asynchronous Write and PAF Flag - IDT Standard Mode .............................................................................................................................. 41
Figure 27. Asynchronous Full Boundary - IDT Standard Mode ...................................................................................................................................... 42
Figure 28. Asynchronous Read and
PAE
Flag - IDT Standard Mode ............................................................................................................................ 42
Figure 29. Serial Loading of Programmable Flag Registers (IDT Standard and FWFT Modes) ...................................................................................... 43
Figure 30. Reading of Programmable Flag Registers (IDT Standard and FWFT Modes) ............................................................................................... 43
Figure 31. Standard JTAG Timing ................................................................................................................................................................................. 44
Figure 33. TAP Controller State Diagram ....................................................................................................................................................................... 46
Figure 34. Depth Expansion Configuration in IDT Standard Mode ................................................................................................................................. 49
Figure 35. Depth Expansion Configuration in FWFT Mode ............................................................................................................................................ 49
Figure 36. Width Expansion Configuration in IDT Standard Mode and FWFT Mode ....................................................................................................... 50
3
FEBRUARY 10, 2009
IDT72T6480 2.5V, SEQUENTIAL FLOW-CONTROL DEVICE
x12, x24, x48 BIT WIDE CONFIGURATION
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
DESCRIPTION
The IDT72T6480 sequential flow-control device is a device incorporating
a seamless connection to external DDR SDRAM for significant storage
capacity supporting high-speed applications. Both read and write ports of the
sequential flow-control can operate independently at up to 133MHz. There
is a user selectable correction feature that will correct any erroneous single
data bit when reading from the SDRAM.
The independent read and write ports each has associated read and write
clocks, enables, and chip selects. Both ports can operate either synchro-
nously or asynchronously. Other features include bus-matching, program-
mable status flags with selectable synchronous/asynchronous timing modes,
IDT Standard or FWFT mode timing, and JTAG boundary scan functionality.
The bus-matching feature will allow the inputs and outputs to be configured
to x48, x24, or x12 bus width. There are four default offset values available
for the programmable flags (PAE/PAF), as well as the option of serially
programming the offsets to a specific value.
The device package is 19mm x 19mm 324-pin PBGA. It operates at a 2.5V
core voltage with selectable 2.5V or 3.3V I/Os. The I/O interface to the SDRAM
will be 2.5V SSTL_2 only and not 3.3V tolerant. Both industrial and commercial
temperature ranges will be offered.
The sequential flow-control device controls individual DDR SDRAM of either
128Mb or 256Mb. The device will support industry standard DDR specification
memories (note DDR II is not supported), which include vendors such as
Samsung, Micron, and Infineon. The data bus connected to the DDR SDRAM
can be 16-bit, 32-bit, or 64-bits wide. The sequential flow-control device can
independently control up to four separate external memories for a maximum of
density of 1Gb (128MB). Depth expansion mode is available for applications