PT7A6632J PERICOM [Pericom Semiconductor Corporation], PT7A6632J Datasheet - Page 21

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

Activation Memory
The Activation Memory map is shown in the Figure 21.
Channel Activation Byte
The Channel Activation Byte are illustrated in the following
table 5. The PT7A6632 reads this byte so that gets the channel
number, the channel state (active or inactive) and the channel
direction (transmit or receive). The PT7A6632 asserts SYSACC
when it accesses the Activation Memory.
PT019(05/02)
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Table 5. Channel Activation Byte
Figure 21a. Activation Memory Map Locations (MDFS = HIGH)
T
e h
c a
v i t
c
1
a h
t a
n n
d e
A
A
A
A
A
l e
(Address)
i t c
i t c
i t c
i t c
i t c
B 7
B 7
B 7
B 7
B
(HEX)
XXBE
XXBF
XXC0
XXC1
XXFE
XX00
XX01
XX7F
XX80
XX81
XX82
XX83
XXFF
t i
t i
t i
t i
t i
e v
e v
e v
e v
e v
7
T
b
b
b
b
b
e d
t i
t i
t i
t i
t i
e h
c a
~ ~
~ ~
~ ~
c
v i t
Active
0
a h
t a
n n
7
d e
l e
Transmit Channel 31 Start Address (High-Order Byte)
Transmit Channel 31 Start Address (Low-Order Byte)
Receive Channel 31 Start Address (High-Order Byte)
Transmit Channel 0 Start Address (High-Order Byte)
Transmit Channel 1 Start Address (High-Order Byte)
Receive Channel 31 Start Address (Low-Order Byte)
Transmit Channel 0 Start Address (Low-Order Byte)
Transmit Channel 1 Start Address (Low-Order Byte)
Receive Channel 0 Start Address (High-Order Byte)
Receive Channel 0 Start Address (Low-Order Byte)
U
6
B 6
B 6
B 6
x
B 6
B
n
t i
t i
t i
t i
t i
s u
Transmit Channels 2 to 30 Start Addresses
Receive Channels 1 to 30 Start Address
6
d e
xx7F Are Not Used by PT7A6632
Rx/Tx
Byte Addresses xx01 Through
5
R
c e
a. MDFS = HIGH (68000 Based)
1
i e
(Contents)
4
e v
R
R
R
R
R
x
x
x
x
x
B 5
B 5
B 5
B 5
B
T /
T /
T /
T /
T /
t i
t i
t i
t i
t i
x
x
x
x
x
5
3
b
b
b
b
b
t i
t i
t i
t i
t i
Channel Number
T
21
PT7A6632 32-Channel HDLC Controller
a r
Channel Buffer Pointers
Channel Buffer Pointers provide PT7A6632 the channel start-
ing address (16-bit) for each channel, 64 channels totally, guid-
ing to a link of buffers containing data and command. The
relative location of the upper and lower bytes of the 16-bit
start address word is determined by the MDFS input (see Fig-
ure 17). The upper address lines (A8-A15) are placed in the
high-impedance state or LOW by the PT7A6632 during the
Activation Memory accesses.
s n
0
m
2
t i
1
B 4
B 4
B 4
B 4
B
t i
t i
t i
t i
t i
4
C
C
C
C
C
a h
a h
a h
a h
a h
0
B 3
B 3
B 3
B 3
B
n n
n n
n n
n n
n n
t i
t i
t i
t i
t i
~ ~
~ ~
~ ~
0
0
0
l e
l e
l e
l e
l e
3
0
0
0
N
N
N
N
N
0
0
0
Channel Activation Byte
u
u
u
u
u
Channel Buffer Pointers
m
m
m
0
0
1
m
m
0
1
0
b
b
b
b
b
B 2
B 2
B 2
B 2
B
r e
r e
r e
r e
r e
e
t i
t i
t i
t i
t i
-
-
-
. c t
c
c
c
2
0
0
0
0
0
a h
a h
a h
~
~
~
~
~
n n
n n
n n
1 3
1 3
1 3
1 3
1 3
l e
l e
l e
Data Sheet
B 1
B 1
B 1
B 1
B
B (
B (
B (
B (
B (
, 0
, 1
, 2
t i
t i
t i
t i
t i
n i
n i
n i
n i
n i
1
r a
r a
r a
r a
r a
) y
) y
) y
) y
) y
B 0
B 0
B 0
B 0
B
t i
t i
t i
t i
t i
Ver:2
0