XC18V00 Series In-System-Programmable Configuration PROMs
DS026 (v5.2) January 11, 2008
Product Specification
2
R
Pinout and Pin Description
Table 1 provides a list of the pin names and descriptions for the 44-pin VQFP and PLCC and the 20-pin SOIC and PLCC
packages.
Table 1: Pin Names and Descriptions
Pin
Name
Boundary-
Scan Order
Function
Pin Description
44-pin VQFP
44-pin
PLCC
20-pin
SOIC &
PLCC
D0
4
DATA OUT
D0 is the DATA output pin to provide data for
configuring an FPGA in serial mode.
40
2
1
3OUTPUT
ENABLE
D1
6
DATA OUT
D0-D7 are the output pins to provide parallel
data for configuring a Xilinx FPGA in Slave
Parallel/SelectMAP mode.
D1-D7 remain in high-Z state when the PROM
operates in serial mode.
D1-D7 can be left unconnected when the
PROM is used in serial mode.
29
35
16
5OUTPUT
ENABLE
D2
2
DATA OUT
42
4
2
1OUTPUT
ENABLE
D3
8
DATA OUT
27
33
15
7OUTPUT
ENABLE
D4
24
DATA OUT
9
15
7(1)
23
OUTPUT
ENABLE
D5
10
DATA OUT
25
31
14
9OUTPUT
ENABLE
D6
17
DATA OUT
14
20
9
16
OUTPUT
ENABLE
D7
14
DATA OUT
19
25
12
13
OUTPUT
ENABLE
CLK
0
DATA IN
Each rising edge on the CLK input increments
the internal address counter if both CE is Low
and OE/RESET is High.
43
5
3
OE/
RESET
20
DATA IN
When Low, this input holds the address
counter reset and the DATA output is in a high-
Z state. This is a bidirectional open-drain pin
that is held Low while the PROM is reset.
Polarity is NOT programmable.
13
19
8
19
DATA OUT
18
OUTPUT
ENABLE
CE
15
DATA IN
When CE is High, the device is put into low-
power standby mode, the address counter is
reset, and the DATA pins are put in a high-Z
state.
15
21
10
CF
22
DATA OUT
Allows JTAG CONFIG instruction to initiate
FPGA configuration without powering down
FPGA. This is an open-drain output that is
pulsed Low by the JTAG CONFIG command.
10
16
7(1)
21
OUTPUT
ENABLE