XCV405E-7BG556I XILINX [Xilinx, Inc], XCV405E-7BG556I Datasheet - Page 20

• Manufacturer Part Number: XCV405E-7BG556I
• Description: Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays
• Manufacturer: XILINX [Xilinx, Inc]

Virtex™-E 1.8 V Extended Memory Field Programmable Gate Arrays
A flowchart for the write operation appears in
Note that if CCLK is slower than f
asserts BUSY, In this case, the above handshake is unnec-
essary, and data can simply be entered into the FPGA every
CCLK cycle.
Abort
During a given assertion of CS, the user cannot switch from
a write to a read, or vice-versa. This action causes the cur-
rent packet command to be aborted. The device remains
BUSY until the aborted operation has completed. Following
an abort, data is assumed to be unaligned to word bound-
aries, and the FPGA requires a new synchronization word
prior to accepting any new packets.
To initiate an abort during a write operation, de-assert
WRITE. At the rising edge of CCLK, an abort is initiated, as
shown in
Module 2 of 4
16
Figure
DATA[0:7]
19.
WRITE
BUSY
CCLK
CS
5
No Write
3
CCNH
1
, the FPGA never
7
Figure 17: Write Operations
Figure
www.xilinx.com
1-800-255-7778
Write
18.
2
Figure 18: SelectMAP Flowchart for Write Operations
No Write
and start-up sequences complete.
later FPGAs enter start-up phase
first FPGAs enter start-up phase
are released, DONE goes High
FPGA checks data using CRC
and pulls INIT Low on error.
clearing pass and releases
configuration memory.
FPGA starts to clear
When all DONE pins
FPGA makes a final
Once per bitstream,
INIT when finished.
releasing DONE.
releasing DONE.
If no errors,
If no errors,
Write
4
6
Apply Configuration Byte
Configuration Completed
Set PROGRAM = High
Disable Data Source
Repeat Sequence A
Enter Data Source
Set WRITE = Low
Set WRITE = High
DS022_45_071702
DS025-2 (v2.1) July 17, 2002
Set CS = High
Set CS = Low
End of Data?
Apply Power
Release INIT
Busy?
INIT?
High
Low
Yes
Low
High
No
If used to delay
configuration
On first FPGA
On first FPGA
For any other FPGAs
ds009_18_111799
Sequence A
R