參數(shù)資料
型號(hào): LPC47M14O-NC
廠商: SMSC Corporation
英文描述: CAT5 AUDIO/VIDEO SPLITTER
中文描述: 128引腳ENGANCED超級(jí)I / O與LPC接口和USB集線器控制器
文件頁(yè)數(shù): 54/205頁(yè)
文件大?。?/td> 1219K
代理商: LPC47M14O-NC
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SMSC DS – LPC47M14X
Page 54
Rev. 05/02/2000
Format A Track
The Format command allows an entire track to be formatted. After a pulse from the nINDEX pin is detected, the FDC
starts writing data on the disk including gaps, address marks, ID fields, and data fields per the IBM System 34 or 3740
format (MFM or FM respectively). The particular values that will be written to the gap and data field are controlled by the
values programmed into N, SC, GPL, and D which are specified by the host during the command phase. The data field
of the sector is filled with the data byte specified by D. The ID field for each sector is supplied by the host; that is, four
data bytes per sector are needed by the FDC for C, H, R, and N (cylinder, head, sector number and sector size
respectively).
After formatting each sector, the host must send new values for C, H, R and N to the FDC for the next sector on the
track. The R value (sector number) is the only value that must be changed by the host after each sector is formatted.
This allows the disk to be formatted with nonsequential sector addresses (interleaving). This incrementing and
formatting continues for the whole track until the FDC encounters a pulse on the nINDEX pin again and it terminates the
command.
Table 25 contains typical values for gap fields that are dependent upon the size of the sector and the number of sectors
on each track. Actual values can vary due to drive electronics.
FORMAT FIELDS
SYSTEM 34 (DOUBLE DENSITY) FORMAT
GAP4a
80x
4E
00
4E
00
L
C
3x
C2
A1
SYSTEM 3740 (SINGLE DENSITY) FORMAT
GAP4a
40x
FF
00
FF
00
L
C
FC
FE
SYNC
12x
IAM
GAP1
50x
SYNC
12x
IDAM
C
Y
H
D
S
E
N
O
C
R
C
GAP2
22x
4E
SYNC
12x
00
DATA
AM
DATA
C
R
C
GAP3
GAP 4b
FC
3x
FE
3x
A1
FB
F8
SYNC
6x
IAM
GAP1
26x
SYNC
6x
IDAM
C
Y
H
D
S
E
N
O
C
R
C
GAP2
11x
FF
SYNC
6x
00
DATA
AM
DATA
C
R
C
GAP3
GAP 4b
FB or
F8
PERPENDICULAR FORMAT
IDAM
C
Y
L
C
3x
A1
GAP4a
80x
4E
SYNC
12x
00
IAM
GAP1
50x
4E
SYNC
12x
00
H
D
S
E
N
O
C
R
C
GAP2
41x
4E
SYNC
12x
00
DATA
AM
DATA
C
R
C
GAP3
GAP 4b
3x
C2
FC
FE
3x
A1
FB
F8
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