Table 8.4 Serdes Transmit Driver Settings In Gen2 Mode With -6.0Db De-Emphasis - Renesas IDT 89HPES48H12G2 User Manual

IDT SerDes
Notes
PES48H12G2 User Manual
Table 8.4 shows a number of possible settings for the drive, de-emphasis, and slew rate controls in
Gen2 mode with -6.0dB de-emphasis
Express 2.0 spec allows an error of up to +/- 0.5dB on the de-emphasis. All settings listed in the table
ensure that the de-emphasis is kept within the allowable range.
Transmit Levels
De-
De-
Drive empha-
empha-
Level sized
sis
Level
903 -5.8 461
901 -5.8 460
899 -5.8 459
897 -5.8 458
895 -5.8 456
884 -5.9 447
874 -6.0 438
864 -6.1 429
853 -6.2 420
853 -6.2 420
853 -6.2 420
853 -6.2 420
853 -6.2 420
800 -6.2 394
748 -6.2 368
695 -6.2 342
642 -6.2 316
605 -6.1 298
568 -6.1 280
530 -6.1 262
493 -6.1 244
450 -6.1 224
407 -6.0 203
363 -5.9 183
320 -5.9 162
Table 8.4 SerDes Transmit Driver Settings in Gen2 Mode with -6.0dB de-emphasis (Part 1 of 2)
1.
Table values are based on simulations using the Snowbush SerDes HSPICE model and device package s-
parameters. Values are sampled at the device pins. The simulation assumes typical conditions, with VddPEA =
VddPETA = 1.0V, VddPEHA = 2.5V, and TX_AMPBOOST = 0x1. Please refer to the device data sheet for post-
silicon device characterization data.
1
. The default setting is highlighted. As mentioned above, the PCI
Settings of Relevant Fields in the
S[x]TXLCTL0 & S[x]TXLCTL1 registers
TDVL_ TX_EQ_
FS6DBG2 6DBG2
0x1C 0x1
0x1B 0x1
0x1A 0x1
0x19 0x1
0x18 0x1
0x17 0x1
0x16 0x1
0x15 0x1
0x14 0x1
0x13 0x1
0x12 0x1
0x11 0x1
0x10 0x1
0x0F 0x1
0x0E 0x1
0x0D 0x1
0x0C 0x1
0x0B 0x1
0x0A 0x1
0x09 0x1
0x08 0x1
0x07 0x1
0x06 0x1
0x05 0x1
0x04 0x1
8 - 8
CDC_ FDC_ TX_SLEW
FS6DBG2 FS6DBG2
0x3 0x1
0x3 0x2
0x3 0x2
0x3 0x2
0x3 0x2
0x3 0x3
0x3 0x3
0x3 0x3
0x3 0x3
0x3 0x2
0x3 0x2
0x3 0x2
0x3 0x2
0x3 0x1
0x3 0x1
0x3 0x1
0x3 0x1
0x1 0x7
0x1 0x7
0x1 0x7
0x1 0x7
0x1 0x5
0x1 0x5
0x1 0x5
0x1 0x5
April 5, 2013
_G2
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0