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2.10 Quick-Start Guide (Pin Mode)
Check that the shunts are at the following positions as
The redrivers are configured to operate in Pin Mode (MODE pins tied to L0).
1. RX_Detect state machine of all redrivers is enabled by leaving RX_DET pin open.
2. The redrivers are enabled (PWDN pins tied to GND).
3. The board is configured for any PCIe bus width.
4. DC Gain of all redrivers is set to 0 dB by leaving the GAIN config pin open for the redrivers.
5. EQ level of the RX CTLEs of all redrivers is set to 7 dB at 8 GHz by default.
6. If necessary, adjust EQ levels of the downstream and upstream redrivers, or both, by arranging shunts on
JMP1, JMP2 for downstream redrivers and JMP11 and JMP14 for the upstream redrivers.
7. Plug the EVM into a PCIe x16 server motherboard slot. Ensure the motherboard is powered down before
installing the EVM or configured for hot-plug operation.
8. Install a compatible PCIe endpoint card into one of the PCIe connectors on the EVM based on configuration
of the SEL pin. Note: PCIe-A requires enabling bifurcation on the motherboard.
9. Power-up the motherboard.
2.11 Quick-Start Guide (SMBus Slave Mode)
1. Configure all devices to operate in the SMBus Slave Mode by setting their MODE pins to the L1 level. This is
accomplished by placing a shunt across pins 15–16 on JMP1, JMP2, JMP11, and JMP14 .
2. Set a unique SMBus Slave address for each device by placing shunts in the following arrangement:
•
On JMP1 connector, place shunt across pins 1-2 L0, downstream device PR412_0.
•
On JMP2 connector, place a shunt across pins 3-4 L1 for downstream device PR412_1.
•
On JMP11 connector, place a shunt across pins 5-6 L2 for upstream device PR421_2.
•
On JMP14 connector, remove shunts across 1-2, 3-4, 5-6 so EQ0_ADD# pin is floating L3 for upstream
device PR421_3.
10
DS160PR412-421EVM Evaluation Module
Table 2-10
Table 2-10. Pin Mode Shunt Configuration
SHNT#
HEADER
1
JMP1
2
JMP1
3
JMP1
4
JMP2
5
JMP2
6
JMP2
7
JMP11
8
JMP11
9
JMP11
10
JMP14
11
JMP14
12
JMP14
13
JMP7
14
JMP8
15
JMP17
16
J17
17
J17
18
J17
19
JMP18
20
JMP19
21
JMP20
Copyright © 2020 Texas Instruments Incorporated
shows.
SHUNT ACROSS
PINS
1-2
7-8
13-14
1-2
7-8
13-14
1-2
7-8
13-14
1-2
7-8
13-14
1-2
2-3
1-2
1-2
3-4
5-6
2-3
2-3
2-3
www.ti.com
SNLU288 – DECEMBER 2020
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