Table 8.4 Serdes Transmit Driver Settings In Gen2 Mode With -6.0Db De-Emphasis - IDT 89HPES64H16G2 User Manual

IDT SerDes
Notes
PES64H16G2 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
901 -5.8
899 -5.8
897 -5.8
895 -5.8
884 -5.9
874 -6.0
864 -6.1
853 -6.2
853 -6.2
853 -6.2
853 -6.2
853 -6.2
800 -6.2
748 -6.2
695 -6.2
642 -6.2
605 -6.1
568 -6.1
530 -6.1
493 -6.1
450 -6.1
407 -6.0
363 -5.9
320 -5.9
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
461 0x1C 0x1
460 0x1B 0x1
459 0x1A 0x1
458 0x19 0x1
456 0x18 0x1
447 0x17 0x1
438 0x16 0x1
429 0x15 0x1
420 0x14 0x1
420 0x13 0x1
420 0x12 0x1
420 0x11 0x1
420 0x10 0x1
394 0x0F 0x1
368 0x0E 0x1
342 0x0D 0x1
316 0x0C 0x1
298 0x0B 0x1
280 0x0A 0x1
262 0x09 0x1
244 0x08 0x1
224 0x07 0x1
203 0x06 0x1
183 0x05 0x1
162 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