
8–8 Chapter 8: PHY IP Core for PCI Express (PIPE)
PIPE Input Data from the PHY MAC
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
Table 8–4 lists the mappings for presets to TX de-emphasis for FS = 40. The 18 bits of
de-emphasis represent the concatenation of {C
+1
, C
0
, C
-1
}.
rx_eidleinfersel[3<n>-1:0]
Input
When asserted high, the electrical idle state is inferred instead of being
identified using analog circuitry to detect a device at the other end of the
link. The following encodings are defined:
■ 3'b0xx: Electrical Idle Inference not required in current LTSSM state
■ 3'b100: Absence of COM/SKP OS in 128 s window for Gen1 or Gen2
■ 3'b101: Absence of TS1/TS2 OS in 1280 UI interval for Gen1 or Gen2
■ 3'b110: Absence of Electrical Idle Exit in 2000 UI interval for Gen1 and
16000 UI interval for Gen2
■ 3'b111: Absence of Electrical Idle exit in 128 s window for Gen1
pipe_rxpresethint[2:0]
Input
Provides the RX preset hint for the receiver. Only used for the Gen3 data
rate.
Table 8–3. Avalon-ST TX Inputs (Part 3 of 3)
Signal Name Dir Description
Gen1 and Gen2
Table 8–4. Preset Mappings to TX De-Emphasis
Preset C
+1
C
0
C
-1
1 001010 011110 000000
2 000111 100001 000000
3 001000 100000 000000
4 000101 100011 000000
5 000000 101000 000000
6 000000 100100 000100
7 000000 100011 000101
8 001000 011000 000100
9 000101 011110 000101
10 000000 100001 000111
11 001100 011100 000000
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