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參數(shù)資料
| 型號(hào)： | TMS279X |
| 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)： | 10/40頁 |
| 文件大小： | 334K |
| 代理商： | TMS279X |
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TMS279X (WD279X) FLOPPY DISK FORMATTER / CONTROLLER FAMILY
10
TABLE 2 - FLAG SUMMARY
COMMAND
TYPE
I
BIT
NUMBER(S)
0, 1
DESCRIPTION
r1 r0 = Stepping Motor Rate
See Table 3 for Rate Summary
I
2
V = Track Number Verify Flag
V = 0, No verify
V = 1, Verify on destination track
I
3
h = Head Load Flag
h = 0, Unload head at beginning
h = 1, Load head at beginning
I
4
T = Track Update Flag
T = 0, No update
T = 1, Update track register
II & III
0
a0 = Data Address Mark
a0 = 0, FB (DAM)
a0 = 1, F8 (deleted DAM)
II
1
C = Side Compare Flag
C = 0, Disable side compare
C = 1, Enable side compare
II & III
1
U = Update SSO
U = 0, Update SSO to 0
U = 1, Update SSO to 1
II & III
2
E = 1 5 ms Delay
E = 0, No. 15 ms delay
E = 1, 15 ms delay (30 ms for 1 MHz)
II
3
S = Side Compare Flag
S = 0, Compare for side 0
S = 1, Compare for side 1
II
3
L = Sector Length Flag
LBS's Sector Length in ID Field
00
L=0
256
L=1
128
01
512
256
10
11
128
1024
1024
512
II
4
m = Multiple Record Flag
m=0, Single record
m=1, Multiple record
IV
0-3
Ix = Interrupt Condition Flags
I0 = 1 Not Ready to Ready Transition
I1 = 1 Ready To Not Ready Transition
I2 = 1 Index Pulse
I3 = 1 Immediate Interrupt, Requires A Reset*
I3-I0 = 0 Terminate With No Interrupt (INTRQ)
*See Type IV command for further information.
write precompensation
When operating in double density mode (DDEN = 0), the 279X has the capability of providing a user-defined
precompensation value for write data. An external potentiometer (10 k) tied to the WPW signal (pin 33)
allows a setting of 100 to 300 ns from nominal.
Setting the write precomp value is accomplished by forcing the TEST# line (pin 22) to a logic 0. A stream of
pulses can then be seen on the write data (pin 31) line. Adjust the WPW potentiometer for the desired pulse
duration. This adjustment may be performed in-circuit since write gate (pin 30) is inactive while TEST# = 0.
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