w83c553f Winbond Electronics Corp America, w83c553f Datasheet - Page 130
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
Port x Drive x Control Registers
Function:
WINBOND SYSTEMS LABORATORY
These registers control the features of the four devices connected to the two ports. All four registers are
identical and control the features of only one device. The Port 0 Drive 0 Control Register (44h-47h)
controls the features of the master drive attached to the primary port. The Port 0 Drive 1 Control Register
(48h-4Bh) controls the features of the slave drive attached to the primary port. The Port 1 Drive 0 Control
Register (4Ch-4Fh) controls the features of the master drive attached to the secondary port. The Port 1
Drive 1 Control Register (50h-53h) controls the features of the slave drive attached to the secondary port.
The command timing controls only affect 16-bit and 32-bit accesses.
Calculations (refer to Table 4-4):
CMD ON TIME programmed value = (DIOR#/DIOW# 16-bit min+29) / 30ns clock - 1, after
removing all digits to the right of the decimal point (see Table 4-4).
CMD OFF TIME programmed value = ((Cycle Time minimum – (CMD ON TIME programmed value
+ 1) * 30ns + 29)) / 30ns clock -1, after removing all digits to the right of the decimal point (see Table
4-4).
CMD ON TIME = Bits [12:8] of Port x Control x Registers , which are the registers of Configuration
Space 44h-54h.
CMD OFF TIME = Bits [4:0] of Port x Control x Registers , which are the registers of Configuration
Space 44h-54h.
Electrical Specifications
127
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