z02201 ZiLOG Semiconductor, z02201 Datasheet - Page 28

• Manufacturer Part Number: z02201
• Description: Z02201 V.22bis Data Pump With Integrated Afe
• Manufacturer: ZiLOG Semiconductor

Software Interface
Table 15. Parallel Interface Register Map
PS000904-0107
Function
RAM Access
Low
RAM Access
High
RAM Access
Address
Parallel Data 3
RAM Control
& Status
Modem
Status
HDLC
Clamping
Carrier Recovery
Register
Number
0
1
2
4
5
7
Note:
Received Data (RXD) is clamped to a constant mark whenever RLSD is OFF.
The recovery circuit can track a ±7 Hz frequency offset in the receiver carrier with
less than 1.0 dB degradation in performance.
The host microprocessor communicates with the Z02201 via the parallel
microprocessor bus interface. Access is provided to a set of seven 8-bit Interface
Registers, and through these registers, to Z02201 RAM memory locations. This
interface allows the host to request modem status information and receive data,
control the configuration, and load data for transmit.
face Register map.
This section refers to the Version 0x48 of the datapump
firmware. For various versions of the datapump and the
differences in firmware refer to the addendum of the product
specification.
RS2–0
b2b1b0
000
001
010
011
100
101
111
MSB
Bit 7
TXlE RXlE RAMlE TPDM
TXI
0
Bit 6
RXI
0
RAMl
0
Bit 5
Bit 4
RAMDL
RAMDH
RAMAL
DATAP
DPBUSY Reserved RTRND CDET
0
V.22BIS Data Pump with Integrated AFE
Bit 3
RTSP
0
Table 15
Bit 2
RAMRW RAMRQ RAMAH R/W
TEND
is the Parallel Inter-
Bit 1
RXERR EOF
LSB
Bit 0
RES
Z02201
Access
Method
R/W
R/W
W
R/W
R
R/W
24