PT7A6632J PERICOM [Pericom Semiconductor Corporation], PT7A6632J Datasheet - Page 29

• Manufacturer Part Number: PT7A6632J
• Description: PT7A6632 32-Channel HDLC Controller
• Manufacturer: PERICOM [Pericom Semiconductor Corporation]

•
The FILL/MASK byte is used as a masking pattern on the
HDLC-formatted (including FLAG, header, data, CRC, and
ABORT code) or non-HDLC-formatted data in order to adapt
subrates that are multiples of 8kb/s to the 64kb/s rate. The 8-
PT019(05/02)
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Table 9. Examples of FILL/MASK Options
*
N
O
O
O
O
O
t
A
u
FILL/MASK Byte (Rate Definition)
e h
p
p
p
p
p
0
m
2
4
i t
i t
i t
3
5
6
7
8
i t
i t
1
p s
*
x e
b
n o
n o
n o
n o
n o
c e
r e
e t
l a i
n r
l a
6 1
4 2
2 3
0 4
8 4
6 5
4 6
p
0
8
D a t
D a t
D a t
D a t
D
R
r u
m
b k
b k
a
a
a
a
a
a
b k
b k
b k
b k
b k
b k
o p
b k
e
a t
e t
m
s /
s /
s /
s /
s /
s /
s /
s /
e s
s /
o
, y r
m
(
(
(
(
(
o
M
M
M
M
M
v e
e d
7 7 7 7 7
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
S
S
S
S
S
n e
) B
) B
) B
) B
) B
n i
h t
w
u o
h
6 6 6 6 6
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
c i
h g
t h
o n
e h
5 5 5 5 5
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
a d
a r t
a t
s n
s i
m
4 4 4 4 4
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
t i
a r t
r e t
B t i
B t i
B t i
B t i
B
s n
t i
o
i m
e p
3 3 3 3 3
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
e t t
t a r
. d
s e
2 2 2 2 2
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
s a
29
PT7A6632 32-Channel HDLC Controller
f i
bit sequence is applied to data on a bit by bit basis to insert 1
(FILL/MASK bit = 0) for time fill, or insert data bit (FILL/
MASK = 1). See an example in Figure 6 in Section “Transmit
Bit-Level Processor” and Table 9.
For bit-oriented signaling mode, the FILL/MASK should be
set as 1111 1111. If not, the PT7A6632 will not override any
other FILL/MASK pattern.
t i
1 1 1 1 1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
s i
t a
4 6
L (
L (
L (
L (
L (
0 0 0 0 0
S
S
S
S
S
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
) B
) B
) B
) B
) B
b k
s /
i ,
N
A
U
A
A
A
A
t S
e v
A
e b
p
o p
s o
o
c n
b r
s
n a
i s r
o t
o t
i s
o t
o t
o t
e s
r e
i t i
a d
o i t
u l
r t i
a t
a t
l a t
a d
l a t
l a t
n o
t n
n o
a t
o l
o l
i d
d
s n
d r
r a
f o
f o
o
f i
b ,
f e
g n
f o
s f
w
t f
b ,
s f
- y
a r
T
n i
o f
l l i
t u
i f
r h
4 6
v e
w
s u
x i
t u
e t
S
e v
d e
r u
e e
E
h
n e
e b
n o
r e
b k
n o
s 1
n i
n e
R
s 1
s 1
y l
s 1
1
E
a p
e s
. s /
y l
e d
a
d
a s
t i
N
a
a
y n
o
i g i
. t n
a
R
R
R
R
R
t t
y n
y n
w t
s i
=
i f
y n
e n
y n
e
e
e
e
e
w
r e
. 1
l a t
e n
w
m
m
m
m
m
E
w
o
e f
w
w
e h
. 1
; n
g i
e h
e h
r a
r a
r a
r a
r a
1
e h
c t
; d
e h
a d
e r
. s
t h
e r
i h
e r
s k
s k
s k
s k
s k
e r
a
e r
a t
a
s a
g n
s 1
s a
1
s a
s a
s a
Data Sheet
1
e s
d
n i
d
o f
d
d
n i
d
v r
f e
d
t a
f e
f e
f e
f e
t r
c i
n i
a
f a
n i
n i
a
n i
n i
m i
y n
, e
d e
y n
d e
d e
d e
o r
d e
f e
e r
y b
m
t
y b
o
y b
y b
y b
w
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t c i
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Ver:2
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