參數(shù)資料
型號： TMS279XN
廠商： Texas Instruments, Inc.
英文描述： FLOPPY DISK FORMATTERICONTROLLER FAMILY
中文描述： 軟盤驅(qū)動FORMATTERICONTROLLER家庭
文件頁數(shù)： 32/40頁
文件大小： 334K
代理商： TMS279XN
TMS279X (WD279X) FLOPPY DISK FORMATTER / CONTROLLER FAMILY
32
non-IBM formats
Variations in the IBM formats are possible to a limited extent if the following requirements are met:
1)
Sector size must be 128, 256, 512 or 1024 bytes.
2)
Gap 2 cannot be varied from the IBM format.
3)
3 bytes of A1 must be used in MFM.
In addition, the Index Address mark is not required for operation by the 279X. Gap 1, 3, and 4 lengths can be
as short as 2 bytes for 279X operation, however PLL lock up time, motor speed variation, write splice area,
etc., will add more bytes to each gap to achieve proper operation. It is recommended that the IBM format be
used for highest system reliability.
FM
MFM
Gap I
Gap II
*
*
Gap III
16 bytes FF
11 bytes FF
6 bytes 00
32 bytes 4E
22 bytes 4E
12 bytes 00
3 bytes A1
24 bytes 4E
8 bytes 00
3 bytes A1
16 bytes 4E
10 bytes FF
4 bytes 00
Gap IV
16 bytes FF
* Byte counts must be exact.
Byte counts are minimum, except exactly 3 bytes of A1 must be written.
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