w83c553f Winbond Electronics Corp America, w83c553f Datasheet - Page 123
w83c553f
Manufacturer Part Number
w83c553f
Description
System I/o Controller With Pci Arbiter
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83C553F.pdf
(159 pages)
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W83C553F
Latency Timer Register (default = 00h)
Function:
Type:
Bit Description:
Header Type Register (default = 80h)
Type:
Bit Description:
WINBOND SYSTEMS LABORATORY
Bit [7:3]
Bit [2:0]
Bits [7:0]:
Read/Write
This register specifies, in PCI bus clocks, the value of the latency timer when operating as a bus master.
Bits 0 through 2 are hardwired to a 0b. Bits 3 through 7 are programmable allowing a programmable
latency value in increments of 8 PCI clocks. The result is a timer granularity of eight clocks. This register
has a default value of 00h.
High-order Timer Bits. Five programmable timer value bits.
Low-order Timer Bits. Hardwire to ground for read-only 0b values.
Read only
This byte identifies the layout of bytes 10h through 3Fh in the configuration space. A default
value of 80h specifies the class codes shown in Table 6-1 of the PCI Specification.
Electrical Specifications
120
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