IDT PCI Express 89HPES32NT24xG2, User Manual, Page: 209 / 744

IDT SMBus Interfaces
PES32NT24xG2 User Manual 12 - 5 January 30, 2013
Notes
Figure 12.3 Sequential Double-word Initialization Sequence Format
The third type of configuration block is the Jump block. The jump configuration block allows non-sequen-
tial execution of the EEPROM initialization sequence. The format of a jump configuration block is shown in
Figure 12.4. The CFG TYPE field indicates the type of the configuration block. For jump configuration
blocks, this value is always 0x2. The JMP CODE field indicates a jump code that is used in conjunction with
the switch mode in order to determine if the jump is taken (see description below). The EEADDR field
contains the serial EEPROM’s byte address at which execution will continue if the jump is taken (i.e., the
jump target address within the serial EEPROM).
A Jump configuration block must indicate a forward jump. That is, the EEADDR field in the Jump config-
uration block must specify a byte address that is greater than the address of the Jump configuration block
itself. For example, a Jump configuration block at byte address 0x10 must specify a jump address no less
than 0x12 (since the Jump configuration block comprehends byte addresses 0x10 to 0x12).
Figure 12.4 Jump Configuration Block
The jump configuration block works in conjunction with the switch mode selected during switch funda-
mental reset (refer to section Partition Resets on page 3-11). Specifically, the chosen switch mode deter-
mines if the jump configuration block is executed or ignored.
Bit
0
Bit
1
Bit
2
Bit
3
Bit
4
Bit
5
Bit
6
Bit
7
Byte 1 SYSADDR[9:2]
Byte 3 NUMDW[7:0]
Byte 4 NUMDW[15:8]
Byte 5 DATA0[7:0]
Byte 6 DATA0[15:8]
Byte 7 DATA0[23:16]
Byte 8 DATA0[31:24]
Byte 4n+5 DATAn[7:0]
Byte 4n+ 6 DATAn[15:8]
Byte 4n+7 DATAn[23:16]
Byte 4n+8 DATAn[31:24]
... ...
CFG TYPE
0x1
Byte 0
Byte 2 SYSADDR[17:10]
Reserved
(must be zero)
Bit
0
Bit
1
Bit
2
Bit
3
Bit
4
Bit
5
Bit
6
Bit
7
Byte 1 EEADDR[7:0]
CFG TYPE
0x2
Byte 0
Byte 2 EEADDR[15:8]
Reserved
(must be zero)
JMP
CODE