User manual

22 www.xilinx.com Virtex-II Prototype Platform
1-800-255-7778 UG015 / PN0401974 (v1.1) January 14, 2003
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5d. Downstream Configuration Interface Connector
The Downstream Configuration Interface connector, as shown in Figure 6, passes select-
map or slave-serial configuration information to a DUT in a downstream prototype
platform from sources such as a MultiLINX cable or a Parallel Cable III.
6. JTAG Control Switch
The JTAG control switch is functional only when the configuration mode switch is set to
JTAG (position 5). The JTAG control switch is used to select the order of the devices in the
JTAG chain using the options shown in Table 7.
Note:
1. The Service FPGA and its supporting Service PROM are not part of the JTAG chain.
2. Since all of the JTAG signals are routed in and out of the Service FPGA multiple times, use
caution to not run the JTAG bus too fast.
Figure 6: Downstream Configuration Interface Connector, 44-Pin Male
VCC3_EN
GND
VCC3_EN
VCC3_EN
VCC3_EN
GND
GND
GND
GND
V5
V5
DOWNSTREAM_M0
DOWNSTREAM_CS3
DOWNSTREAM_CS2
DOWNSTREAM_CS1
DOWNSTREAM_CS0
GND
GND
GND
DOWNSTREAM_HSWAP_EN
DOWNSTREAM_M2
DOWNSTREAM_M1
DOWNSTREAM_PWRDWN
DOWNSTREAM_DOUT
DOWNSTREAM_INIT
DOWNSTREAM_PROG
DOWNSTREAM_RDWR
DOWNSTREAM_TDI
DOWNSTREAM_TDO
DOWNSTREAM_TMS
DOWNSTREAM_TCK
V5
V5
DOWNSTREAM_D6
DOWNSTREAM_D7
DOWNSTREAM_DONE
DOWNSTREAM_CCLK
NC
DOWNSTREAM_D1
DOWNSTREAM_D2
DOWNSTREAM_D0
DOWNSTREAM_D3
DOWNSTREAM_D4
DOWNSTREAM_D5
15 13 11 9 7 5 3 11719212325272931333537394143
16 14 12 10 8 6 4 21820222426283032343638404244
UG015_06_051001
Table 7: JTAG Control Options
Switch Number Mode Description
0 DUT DUT only in chain
1 PROM User PROM only in chain
2DUT → PROM DUT first, PROM second in chain
3PROM → DUT PROM first, DUT second in chain
4 Feedthrough Allows a board to be switched out of the JTAG
chain without physically removing it