PT7A6632 Datasheet, PDF (33/61 Pages) Pericom Semiconductor Corporation – PT7A6632 32-Channel HDLC Controller

Data Sheet
PT7A6632 32-Channel HDLC Controller
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Receive Command Buffer
The Receive Command Buffer contains 8 bytes of descriptors and 2 bytes of Channel Mode & Rate Definition Data (and maybe
Hyperchannel Configuring Bytes) as shown in Figure 27. The MDFS pin decides the MS byte and LS byte locations (in even
and odd addresses).
Figure 27. Receive Command Buffer
(Address) 7
(Contents)
0
i ^msb
i+1
Next Buffer
lsb ^Address
i+2
Not used
i+3
Not used
i+4
Not used
i+5 ^msb
lsb Data Length (j)
i+6
Not Used
i+7
x IVBA
Not used
CMND MPTY
(1)
Status
(i+7)+1 ^{0 0 0 0 INV LOOP SIG HDLC} Mode
(i+7)+2
FILL/MASK
(i+7)+3 ^{E A x}
Channel Number
~~
~~
(i+7)+j ^{E A x}
Channel Number
a. MDFS = 1
(Address) 7
(Contents)
0
i
i+1 _msb
i+2
Not used
lsb Next Buffer
Address
i+3
Not used
i+4 _msb
i+5
i+6
x IVBA
i+7
Not used
Not used
Not used
lsb Data Length (j)
CMND MPTY
(1)
Status
(i+7)+1 ^{0 0 0 0 INV LOOP SIG HDLC} Mode
(i+7)+2
FILL/MASK
(i+7)+3 ^{E A x}
Channel Number
~~
(i+7)+j E A x
~~
Channel Number
b. MDFS = 0
PT019(05/02)
33
Ver:2