RFX144V24-S23 and RFX96V24-S23 Modem Designer’s Guide
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Table 3-1. Interface Memory Bit Definitions (Cont'd)
Mnemonic
Location
Default
Name/Description
WDSZ
14:0,1
--
Data Word Size (Parallel Mode). In V.23 mode, the WDSZ bits set the number of data bits per
character as follows:
Bit 1
Bit 0
Data Bits/Character
0
0
5
0
1
6
1
0
7
1
1
8
WRT1
05:1
0
RAM Write 1. When control bit WRT1 is a 1 and ACC1 is a 1, the modem writes the data from the Y
RAM Data 1 registers into its internal RAM at the location addressed by AREX1, ADD1, and CR1.
(When the most significant bit of ADD1 is a 0, the write is performed to the X RAM location; when a 1,
the write is to the Y RAM location.) When WRT1 is a 0 and ACC1 is set to a 1, the modem reads data
from its internal RAM from the locations addressed by AREX1, ADD1, and CR1, and stores the data into
the X RAM Data 1 registers and Y RAM Data 1 registers, respectively.
WRT2
15:1
0
RAM Write 2. When control bit WRT2 is a 1 and ACC2 is a 1, the modem writes the data from the Y
RAM Data 2 registers into its internal RAM at the location addressed by AREX2, ADD2, and CR2.
(When the most significant bit of ADD2 is a 0, the write is performed to the X RAM location; when a 1,
the write is to the Y RAM location.) When WRT2 is a 0 and ACC2 is a 1, the modem reads data from its
internal RAM from the locations addressed by AREX2, ADD2, and CR2, and stores the data into the X
RAM Data 2 registers and Y RAM Data 2 registers, respectively.
XDAL1
02:0-7
–
X RAM Data 1 LSB. XDAL1 is the LSB of the 16-bit X RAM 1 data word used in reading X RAM
locations.
XDAL2
12:0-7
–
X RAM Data 2 LSB. XDAL2 is the LSB of the 16-bit X RAM 2 data word used in reading X RAM
locations.
XDAM1
03:0-7
–
X RAM Data 1 MSB. XDAM1 is the most significant byte of the 16-bit X RAM 1 data word used in
reading X RAM locations.
XDAM2
13:0-7
–
X RAM Data 2 MSB. XDAM2 is the most significant byte of the 16-bit X RAM 2 data word used in
reading X RAM locations.
YDAL1
00:0-7
–
Y RAM Data 1 LSB. YDAL1 is the LSB of the 16-bit Y RAM 1 data word used in reading Y RAM
locations, or writing X or Y RAM locations in the modem.
YDAL2
10:0-7
–
Y RAM Data 2 LSB. YDAL2 is the LSB of the 16-bit Y RAM 2 data word used in reading Y RAM
locations, or writing X or Y RAM locations in the modem.
YDAM1
01:0-7
–
Y RAM Data 1 MSB. YDAM1 is the MSB of the 16-bit Y RAM 1 data word used in reading Y RAM
locations, or writing X or Y RAM locations in the modem.
YDAM2
11:0-7
–
Y RAM Data 2 MSB. YDAM2 is the MSB of the 16-bit Y RAM 2 data word used in reading Y RAM
locations, or writing X or Y RAM locations in the modem.
ZEROC
09:4
0
Zero Clamp. In HDLC mode, when control bit ZEROC is a 1 and ABIDL is a 1, the modem will transmit
continuous zeros. When ZEROC is a 0 and ABIDL is a 1, the modem will transmit continuous ones. If
ABIDL is a 0, ZEROC is disabled.
Summary of Contents for RFX144V24-S23
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