MK50H27(1997) 데이터 시트보기 (PDF) - STMicroelectronics
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MK50H27 Datasheet PDF : 56 Pages
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MK50H27
4.2.1 Mode Register
The Mode Register allows alteration of the MK50H27’s operating parameters.
IADR + 00
1111110000000000
5432109876543210
MFS
<4:0>
E
X
T
C
E
X
T
A
D
A
C
E
E
X
T
C
E
X
T
A
D
R
C
K
D
T
C
K
C
K
S
FF
LBACK
<2:0>
BIT
15:11
NAME
MFS<4:0>
NUMBER OF FLAGS
1
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
DESCRIPTION
Minimum Frame Spacing defines the minimum number of flag
sequences transmitted between adjacent frames transmitted by the
MK50H27. This only affects frames transmitted by the MK50H27
and does not restrict the spacing of the frames received by the
MK50H27. When using RTS/CTS control this field defines the
number of flags transmitted at the beginning of the frame after
CTS is driven low (minus one for the trailing flag). See the fol-
lowing table for encoding of this field.
MFS<4:0>
1
0
2
4
9
18
5
11
22
12
25
19
7
15
31
30
NUMBER OF FLAGS
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
MFS<4:0>
28
24
17
3
6
13
27
23
14
29
26
21
10
20
8
16
10 EXTCF
09 EXTAF
08
DACE
07 EXTC
06 EXTA
Extended Control Force. Must be reset to zero for both SS7 and HDLC
transparent mode
Extended Address Force. If set along with EXTA, the receiver will
assume the address to be two otets long regardless of the first bit of
the address. See EXTA below. Must be set to a 1 for SS7 operation.
Must be reset to a zero for HDLC transparent mode.
Disable Address and Control field Extraction. DACE should be written
with ”0” for normal SS7 operation and with ”1” for HDLC Transparent
mode. The MK50H27 however, has a feature to allow shifting of the
alignment of the data in the MSU buffers. If DACE is set to ”1” for SS7
mode, the received LI will be placed in the first byte of the receive buff-
er, followed by the SIO in the second byte and so on. If DACE = 1, on
transmit the LI must be placed in the first byte of the transmit buffer
rather than in the SUL field of the Transmit Descriptor Entry (TMD2).
Extended Control Field. Must be reset to zero for both SS7 and HDLC
transparent mode.
Extended address Field. Must be set to a 1 for SS7 operation. Must
be reset to a zero for HDLC transparent mode.
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