R
XC18V00 Series of In-System Programmable Configuration PROMs
Table 1: Pin Names and Descriptions (pins not listed are “no connect”) (Continued)
20-pin
Boundary
Scan
Order
44-pin 44-pin
VQFP PLCC
Pin
Name
SOICand
PLCC
Function
Pin Description
CF
22
21
DATA OUT Allows JTAG CONFIG instruction to initiate FPGA
configuration without powering down FPGA. This is
10
16
7(1)
OUTPUT
an open-drain output that is pulsed Low by the
ENABLE
JTAG CONFIG command.
CEO
11
12
DATA OUT Chip Enable Output (CEO) is connected to the CE
input of the next PROM in the chain. This output is
21
27
13
OUTPUT
Low when CE is Low and OE/RESET input is High,
ENABLE
AND the internal address counter has been
incremented beyond its Terminal Count (TC) value.
When OE/RESET goes Low, CEO stays High until
the PROM is brought out of reset by bringing
OE/RESET High.
GND
TMS
GND is the ground connection.
6, 18,
28 &
41
3, 12,
24 &
34
11
5
MODE
SELECT
The state of TMS on the rising edge of TCK
determines the state transitions at the Test Access
Port (TAP) controller. TMS has an internal 50K ohm
resistive pull-up on it to provide a logic “1” to the
device if the pin is not driven.
5
11
TCK
TDI
CLOCK
DATA IN
This pin is the JTAG test clock. It sequences the
TAP controller and all the JTAG test and
programming electronics.
7
3
13
9
6
4
This pin is the serial input to all JTAG instruction
and data registers. TDI has an internal 50K ohm
resistive pull-up on it to provide a logic “1” to the
system if the pin is not driven.
TDO
DATA OUT This pin is the serial output for all JTAG instruction
and data registers. TDO has an internal 50K ohm
resistive pull-up on it to provide a logic “1” to the
system if the pin is not driven.
31
37
17
VCC
Positive 3.3V supply voltage for internal logic and
input buffers.
17, 35 23, 41
& 38 & 44
18 & 20
19
VCCO
Positive 3.3V or 2.5V supply voltage connected to
the output voltage drivers.
8, 16, 14, 22,
26 &
36
32 &
42
Notes:
1. Pin 7 is CF in Serial Mode, D4 in Slave-Parallel Mode for 20-pin packages.
DS026 (v3.0) November 12, 2001
www.xilinx.com
3
Product Specification
1-800-255-7778
XILINX [ XILINX, INC ]
