z02201 ZiLOG Semiconductor, z02201 Datasheet - Page 43

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

Table 20. Modem Data Pump Word Definitions (Continued)
PS000904-0107
Register & Address
(hex)
Default
Value
Function and Explanation
b15..
b8
b7
b3
b2
b1
b0
Set these bits to 0 when setting Bufctrl.HDLC to 1.
HDLC (Set HDLC Mode: all data modes)
Set HDLC mode. When parallel data transfer mode is selected
(TPDM is 1) and HDLC is set, the data pump transfers data
using the synchronous HDLC mode. In serial mode (TPDM is
0), this bit has no effect.
The host should set bits 8–15 to 0 when it sets this bit to 1.
SCRDIS (Scrambler Disable: V.22, V.22bis, Bell 212A)
Set this bit to disable the transmitter scrambler. This action
takes precedence over TRNCTRL/TXCTRL.
TXMHLD (Hold Tx Output to Marks: all modes)
Set this bit to force the data pump to transmit only marks to the
remote modem, disregarding data received from the host.
DSCRDIS (Descrambler Disable: V.22, V.22bis, Bell 212A).
Set this bit to disable the receiver descrambler.
RXMHLD (Hold Rx Output to Marks: all modes)
Set RXMHLD to 1 to cause the data pump to transmit only
marks to the host, disregarding data received from the remote
modem.
V.22BIS Data Pump with Integrated AFE
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