參數(shù)資料
型號(hào)： TMS279XN
廠商： Texas Instruments, Inc.
英文描述： FLOPPY DISK FORMATTERICONTROLLER FAMILY
中文描述： 軟盤驅(qū)動(dòng)FORMATTERICONTROLLER家庭
文件頁數(shù)： 39/40頁
文件大?。?/td> 334K
代理商： TMS279XN
TMS279X (WD279X) FLOPPY DISK FORMATTER / CONTROLLER FAMILY
39
TABLE 4 - STATUS REGISTER SUMMARY
BIT
ALL TYPE I
COMMANDS
READ
ADDRESS
READ
SECTOR
READ
TRACK
WRITE
SECTOR
WRITE
TRACK
S7
NOT READY
NOT READY
NOT READY
NOT READY
NOT READY
NOT READY
S6
WRITE
PROTECT
0
0
0
WRITE
PROTECT
WRITE
PROTECT
S5
HEAD
LOADED
0
RECORD
TYPE
0
0
0
S4
SEEK ERROR
RNF
RNF
0
RNF
0
S3
CRC ERROR
CRC ERROR
CRC ERROR
0
CRC ERROR
0
S2
TRACK 0
LOST DATA
LOST DATA
LOST DATA
LOST DATA
LOST DATA
S1
INDEX PULSE
DRQ
DRQ
DRQ
DRQ
DRQ
SO
BUSY
BUSY
BUSY
BUSY
BUSY
BUSY
status for type I commands
BIT NAME
MEANING
S7 NOT READY
This bit when set indicates the drive is not ready. When reset it indicates that the drive is
ready. This bit is an inverted copy of the ready input and logically 'ORed' with MR.
S6 PROTECTED
When set, indicates write protect is activated. This bit is an inverted copy of WRPT# input.
S5 HEAD LOADED
When set, it indicates the head is loaded and engaged. This bit is a logical "AND" of HLD
and HLT signals.
S4 SEEK ERROR
When set, the desired track was not verified. This bit is reset to 0 when updated.
S3 CRC ERROR
CRC encountered in ID field.
S2 TRACK 00
When set, indicates read/write head is positioned to Track 0. This bit is an inverted copy
of the TR00# input.
S1 INDEX
When set, indicates index mark detected from drive. This bit is an inverted copy of the IP#
input.
S0 BUSY
When set, command is in progress. When reset, no command is in progress.
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