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(pán)驅(qū)動(dòng)FORMATTERICONTROLLER家庭
文件頁(yè)數(shù)： 29/40頁(yè)
文件大小： 334K
代理商： TMS279XN
TMS279X (WD279X) FLOPPY DISK FORMATTER / CONTROLLER FAMILY
29
status register
Upon receipt of any command, except the Force Interrupt command, the busy status bit is set and the rest of
the status bits are updated or cleared for the new command. If the Force Interrupt command is received
when there is a current command under execution, the busy status bit is reset, and the reset of the status
bits are unchanged. If the Force Interrupt command is received when there is not a current command under
execution, the busy status bit is reset and the rest of the status bits are updated or cleared. In this case,
status reflects the Type I commands.
The user has the option of reading the status register through program control or using the DRQ line with
DMA or interrupt methods. When the data register is read, the DRQ bit in the status register and the DRQ
line are automatically reset. A write to the data register also causes both DRQ's to reset.
The busy bit in the status may be monitored with a user program to determine when a command is complete,
in lieu of using the INTRQ line. When using the INTRQ, a busy status check is not recommended because a
read of the status register to determine the condition of busy will reset the INTRQ line.
The format of the status register is shown below:
(BITS)
7
6
5
4
3
2
1
0
S7
S6
S5
S4
S3
S2
S1
S0
Status varies according to the type of command executed as shown in Table 4.
Because of internal sync cycles, certain time delays must be observed when operating under programmed
1/0. They are: (times double when clock = 1 MHz).
OPERATION
NEXT OPERATION
DELAY REG’D
FM
12 μs
28 μs
0
MFM
6 μs
14 μs
0
Write to Command Register
Write to Command Register
Write Any Register
Read Busy Bit (Status Bit 0)
Read Status Bits 1-7
Read from Different Register
IBM 3740 format - 128 bytes/sector
Shown below is the IBM single-density format with 128 bytes/sector. In order to format a diskette, the user
must issue the Write Track command, and load the data register with the following values. For every byte to
be written, there is one data request.
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