RC2324DPL ETC, RC2324DPL Datasheet - Page 27

• Manufacturer Part Number: RC2324DPL
• Description: Single Device Data/fax Modem Data Pump
• Manufacturer: ETC

RC96V24DP
Single Device Data/Modem Data Pump
Table 3-2. Interface Memory Bit Functions (Continued)
Mnemonic
XDAM
YDAM
XCRD
YADD
YCRD
XDAL
YACC
YDAL
XWT
YWT
XCR
YCR
Location
Memory
18:0-7
19:0-7
16:0-7
17:0-7
1A0-7
1D:0
1D:2
1D:1
1B:7
15:0
15:2
1B:1
3.4 DSP RAM Access
The DSP contains four sections of 16-bit wide random access memory (RAM).
Because the DSP is optimized for performing complex arithmetic, the RAM is
organized into real (X RAM) and imaginary (Y RAM) sections, as well as data
and coefficient sections. The host processor can access (read or write) the X
RAM only, the Y RAM only, or both the X RAM and the Y RAM simultaneously
in either the data or coefficient section.
X Coefficient RAM Select. Controls XADD access to the DSP’s X Coefficient RAM or the
X Data RAM.
X RAM Continuous Read. Enables read of X RAM every sample from the location
addressed by XADD independent of the XACC and XWT bits.
X RAM Data LSB. The least significant byte of the 16-bit X RAM data word used in
reading or writing X RAM locations in the DSR
X RAM Data MSB. The most significant byte of the 16-bit X RAM data word used In
reading or writing X RAM locations in the DSR
X RAM Write. Controls the reading of data from, or the writing of data to, the X RAM
Data registers (18 and 19) using the X RAM location addressed by XADD and XCR.
Y RAM Access Enable. Controls DSP access of the Y RAM associated with the address
In YADD and the YCR bit. YWT determines if a read or write is performed.
Y RAM Address. Contains the Y RAM address used to access the DSP’s V Data RAM or V
Coefficient RAM (selected by YCR) via the Y RAM Data LSB and MSB registers.
Y Coefficient RAM Select. Controls YADD access to the DSP’s Y Coefficient RAM or the
Y Data RAM.
Y RAM Continuous Read. Enables read of Y RAM every sample from the location
addressed by YADD Independent of the YACC and YWT bits.
Y RAM Data LSB. The least significant byte of the 16-bit Y RAM data word used in
reading or writing Y RAM locations in the DSP
Y RAM Data MSB. The most significant byte of the 16-bit Y RAM data word used in
reading or writing Y RAM locations in the DSP.
Y RAM Write. Controls the reading of data from, or the writing of data to. the Y RAM
Data registers (16 and 17) using the Y RAM location addressed by YADD and YCR.
D96V24DSA
Name/Description
3.0 Software Interface
3.4 DSP RAM Access
3-7