參數(shù)資料
型號： W83977CTF-AW
英文描述： PERIPHERAL (MULTIFUNCTION) CONTROLLER
中文描述： 周邊（多功能）控制器
文件頁數(shù)： 49/161頁
文件大?。?/td> 592K
代理商： W83977CTF-AW
W83977EF/ CTF
PRELIMINARY
Publication Release Date: March 1999
-40 -
Revision A1
DRATE1 DRATE0 (Bit 1, 0):
These two bits select the data rate of the FDC and reduced write current control.
00 500 KB/S (MFM), 250 KB/S (FM), RWC#= 1
01 300 KB/S (MFM), 150 KB/S (FM), RWC#= 0
10 250 KB/S (MFM), 125 KB/S (FM), RWC#= 0
11 1 MB/S (MFM), Illegal (FM), RWC#= 1
The 2 MB/S data rate for Tape drive is only supported by setting 01 to DRATE1 and DRATE0 bits, as
well as setting 10 to DRT1 and DRT0 bits, which are two of the Configure Register CRF4 or CRF5
bits in logic device 0. Please refer to the function description of CRF4 or CRF5 and data rate table for
individual data rates setting.
2.2.7 FIFO Register (R/W base address + 5)
The Data Register consists of four status registers in a stack, with only one register presented to the
data bus at a time. This register stores data, commands, and parameters and provides diskette-drive
status information. Data bytes are passed through the data register to program or obtain results after
a command. In the W83977EF/CTF, this register defaults to FIFO disabled mode after reset. The
FIFO can change its value and enable its operation through the CONFIGURE command.
Status Register 0 (ST0)
7-6
5
4
3
2
1-0
US1, US0 Drive Select:
00 Drive A selected
01 Drive B selected
10 Drive C selected
11 Drive D selected
HD Head address:
1 Head selected
0 Head selected
NR Not Ready:
1 Drive is not ready
0 Drive is ready
EC Equipment Check:
1 When a fault signal is received from the FDD or the track
0 signal fails to occur after 77 step pulses
0 No error
SE Seek end:
1 seek end
0 seek error
IC Interrupt Code:
00 Normal termination of command
01 Abnormal termination of command
10 Invalid command issue
11 Abnormal termination because the ready signal from FDD changed state during command execution
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W83977CTF-PW 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O
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W83977EF-AW 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND ISA I/O
W83977EF-PW 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O
W83977EG 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND ISA I/O
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