W83C553F Datasheet, PDF (40/159 Pages) Winbond – SYSTEM I/O CONTROLLER WITH PCI ARBITER

W83C553F
Electrical Specifications
3.9 PCI Configuration Write Cycle
The Configuration Write command (C/BE[3:0]# = Bh during address phase) is used in slave mode to write to the
configuration registers. 8-bit, 16-bit, 24-bit and 32-bit accesses are supported when the IDSEL is asserted and AD[1:0] are
00. The PCI controller will respond to all Configuration write cycles, even for bytes not used. During the PCI address phase
AD[7:2] define the DWORD accessed, while the byte enables (C/BE[3:0]#) address the byte(s) within each DWORD.
Refer to Figure 3-5. The Slave Configuration Write command cycle is used by the host processor to write the PCI
configuration space in the W83C553F. This permits the processor to control basic W83C553F activity, such as
enable/disable, change I/O location, etc. It is a single, non-burst, 8, 16 or 32-bit transfer, of fixed duration, i.e. the
W83C553F will assert TRDY# on the 4th bus cycle of the transfer.
Figure 3-5. Slave Configuration Write Timing
WINBOND SYSTEMS LABORATORY
37