PT7A6632 Datasheet, PDF (26/61 Pages) Pericom Semiconductor Corporation – PT7A6632 32-Channel HDLC Controller

Data Sheet
PT7A6632 32-Channel HDLC Controller
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Transmit Command Buffer
The Transmit Command Buffer contains 8 bytes of descriptors and 2 bytes of Channel Mode & Rate Definition Data (and maybe
the Hyperchannel Configuring Bytes) as shown in Figure 24. The MDFS pin decides the MS byte and LS byte locations (in even
and odd addresses).
Figure 24. Transmit 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
CF/P ₍₁₎ MPTY _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
lsb Data Length (j)
i+5
Not used
i+6
x IVBA
Not used
- _CF/P CMND _MPTY
(1)
Status
i+7
Not used
(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)
26
Ver:2