Table 16 - Description of Command Symbols
SYMBOL
WGATE
NAME
Write Gate
DESCRIPTION
Alters timing of WE to allow for pre-erase loads in perpendicular
drives.
INSTRUCTION SET
Table 17 - Instruction Set
READ DATA
DATA BUS
PHASE
Command
R/W D7
D6
D5 D4 D3 D2 D1 D0
REMARKS
Command Codes
W
W
W
MT MFM SK
0
0
0
0
0
1
1
0
0
0
HDS DS1 DS0
──────── C ────────
Sector ID information prior to
Command execution.
W
W
W
W
W
W
──────── H ────────
──────── R ────────
──────── N ────────
─────── EOT ───────
─────── GPL ───────
─────── DTL ───────
Execution
Result
Data transfer between the
FDD and system.
Status information after Com-
mand execution.
R
─────── ST0 ───────
R
R
R
─────── ST1 ───────
─────── ST2 ───────
──────── C ────────
Sector ID information after
Command execution.
R
R
R
──────── H ────────
──────── R ────────
──────── N ────────
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