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NOTES:
1. Pulse width on RAW READ (Pin 27) is normally
100-300 ns. However, pulse may be any width i1
pulse is entirety within window. If pulse occurs in both
Windows, then pulse width must bs Isss than 300 ns
for MFM at CLK = 2 MHz and 600 ns for FM at 2
MHz. Times double (or 1 MHz.
2. A PPL Data Separator is recommended for 8" MFM.
3. tbc should ba 2 ms. nominal in MFM and 4 ps nominal
in FM. Times double when CLK = 1 MHz.
•
4. RCLK may be high or tow during RAW READ (Polarity
is unimportanl).
5. Times double when dock = 1 MHz.
6. Output tlmlrtg readings are at Vol = 0.6v and Voh =
2.0v.
M1SCELLANEOUS TIMING
•FROM STEP RATE TABLE
Table 4. STATUS REGISTER SUMMARY
BIT
S7
S6
S5
S4
S3
S2
S1
SO
ALL TYPE I
COMMANDS
NOT READY
WRITE
PROTECT
HEAD LOADED
SEEK ERROR
CRC ERROR
TRACK 0
INDEX PULSE
BUSY
READ
ADDRESS
NOT READY
0
0
RNF
CRC ERROR
LOST DATA
DRÖ
BUSY
REAO
SECTOR
NOT READY
0
RECORD TYPE
RNF
CRC ERROR
LOST DATA
DRQ
BUSY
READ
TRACK
NOT READY
0
0
0
0
LOST DATA
DRQ
BUSY
WRITE
SECTOR
NOT READY
WRITE
PROTECT
WRITE FAULT
RNF
CRC ERROR
LOST DATA
DRQ
BUSY
WRITE
TRACK
NOT READY
WRITE
PROTECT
WRITE FAULT
0
0
LOST DATA
DRQ
BUSY
STATUS FOR TYPE I COMMANDS
BIT NAME
S7 NOT READY
S6 PROTECTED
S5 HEAD LOADED
S4 SEEK ERROR
S3 CRC ERROR
S2 TRACK 00
S1 INDEX
SO BUSY
MEANING
This bit when set indicates ths drive is not ready. When reset It indicates that the drive
is ready. This bit is an inverted copy o1 the Ready Input and logically 'ored' wlth MR.
Whsn set, indicates Write Protect is activated. This bit is an inverted copy of WRPT
input.
Whsn set, ii indicates the head is loaded and engaged. This bit is a logical "and" of
HLD and HLT Signals.
When set, the desired track was not verified. This bit is reset to 0 whsn updated.
CRC encountered in ID field.
When set, indicates Read/Write head is positioned to Track 0. This bit is an inverted
copy of the TROO input.
When set, indicates index mark dstected from drive. This bit is an inverted copy of the
IP input.
When set command is in progress. When reset no command is in progress.
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