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| 型號： | XC5210-3TQ176I |
| 英文描述： | Field Programmable Gate Array (FPGA) |
| 中文描述： | 現(xiàn)場可編程門陣列（FPGA） |
| 文件頁數(shù)： | 36/73頁 |
| 文件大?。?/td> | 598K |
| 代理商： | XC5210-3TQ176I |
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R
XC5200 Series Field Programmable Gate Arrays
7-118
November 5, 1998 (Version 5.2)
Synchronous Peripheral Mode
Synchronous Peripheral mode can also be considered
Slave Parallel mode. An external signal drives the CCLK
input(s) of the FPGA(s). The first byte of parallel configura-
tion data must be available at the Data inputs of the lead
FPGA a short setup time before the rising CCLK edge.
Subsequent data bytes are clocked in on every eighth con-
secutive rising CCLK edge.
The same CCLK edge that accepts data, also causes the
RDY/BUSY output to go High for one CCLK period. The pin
name is a misnomer. In Synchronous Peripheral mode it is
really an ACKNOWLEDGE signal. Synchronous operation
does not require this response, but it is a meaningful signal
for test purposes. Note that RDY/BUSY is pulled High with
a high-impedance pullup prior to INIT going High.
The lead FPGA serializes the data and presents the pre-
amble data (and all data that overflows the lead device) on
its DOUT pin. There is an internal delay of 1.5 CCLK peri-
ods, which means that DOUT changes on the falling CCLK
edge, and the next FPGA in the daisy chain accepts data
on the subsequent rising CCLK edge.
In order to complete the serial shift operation, 10 additional
CCLK rising edges are required after the last data byte has
been loaded, plus one more CCLK cycle for each
daisy-chained device.
Synchronous Peripheral mode is selected by a <011> on
the mode pins (M2, M1, M0).
X9005
CONTROL
SIGNALS
DATA BUS
PROGRAM
DOUT
M0 M1
CCLK
M2
D
0-7
INIT
DONE
PROGRAM
4.7 k
3.3 k
3.3 k
RDY/BUSY
V
CC
OPTIONAL
DAISY-CHAINED
FPGAs
NOTE:
M2 can be shorted to Ground
if not used as I/O
CLOCK
PROGRAM
DOUT
XC5200E/EX
SLAVE
M0 M1
CCLK
N/C
8
M2
DIN
INIT
DONE
N/C
XC5200
SYNCHRO-
NOUS
PERIPHERAL
Figure 33: Synchronous Peripheral Mode Circuit Diagram
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