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TMS279X Datasheet(PDF) 9 Page - Texas Instruments

Part # TMS279X
Description  FLOPPY DISK FORMATTERICONTROLLER FAMILY
PDF  40 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMS279X Datasheet(HTML) 9 Page - Texas Instruments

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TMS279X (WD279X) FLOPPY DISK FORMATTER / CONTROLLER FAMILY
9
ready
Whenever a Read or Write command (Type II or III) is received, the 279X samples the ready input. If this
input is logic low the command is not executed and an interrupt is generated. All Type I commands are
performed regardless of the state of the ready input. Also, whenever a Type II or III command is received,
the TG43 signal output is updated. TG43 may be tied to ENP to enable write precompensation on tracks
44-76.
command description
The TMS279X will accept eleven commands. Command words should only be loaded in the command
register when the busy status bit is off (status bit 0). The one exception is the Force Interrupt command.
Whenever a command is being executed, Be busy status bit is set. When a command is completed, an
interrupt is generated and the busy status bit is reset. The status register indicates whether the completed
command encountered an error or was fault free. For ease of discussion, commands are divided into four
types. Commands and Types are summarized in Table 1.
TABLE 1 - COMMAND SUMMARY
COMMANDS FOR MODELS
2791,2793
COMMANDS FOR 2795,2797
TYPE
COMMAND
BITS
BITS
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
I
Restore
0
0
0
0
h
V
r1
r0
0
0
0
0
h
V
r1
r0
I
Seek
0
0
0
1
h
V
r1
r0
0
0
0
1
h
V
r1
r0
I
Step
0
0
1
T
h
V
r1
r0
0
0
1
T
h
V
r1
r0
I
Step-in
0
1
0
T
h
V
r1
r0
0
1
0
T
h
V
r1
r0
I
Step-out
0
1
1
T
h
V
r1
r0
0
1
1
T
h
V
r1
r0
II
Read Sector
1
0
0
m
S
E
C
0
1
0
0
m
L
E
U
0
II
Write Sector
1
0
1
m
S
E
C
a0
1
0
1
m
L
E
U
a0
III
Read Address
1
1
0
0
0
E
0
0
1
1
0
0
0
E
U
0
III
Read Track
1
1
1
0
0
E
0
0
1
1
1
0
0
E
U
0
III
Write Track
1
1
1
1
0
E
0
0
1
1
1
1
0
E
U
0
IV
Force Interrupt
1
1
0
1
I3
I2
I 1
10
1
1
0
1
I3
I2
I 1
10



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