RFX144V24-S23 and RFX96V24-S23 Modem Designer’s Guide
1070
4-5
ACCx = 0
Start Read
WRTx = 0
Read YDAMx and YDALx or
Read XDAMx and XDALx
depending upon access code
B1A = 1 (x = 1) or
B2A = 1 (x = 2)?
Yes
Read YDALx to reset BxA
Store relevant access code in
ADDx , AREXx, SBADxM and
SBADxL
CRx, IOx, and SBRAMx = 0 or 1
as appropriate
ACCx = 1
More to read?
End Read
Yes
Notes:
1. If RAM Access 1 is used, x = 1. If RAM Access 2 is used, x = 2.
Either RAM Access 1 or 2 may be used to read or write RAM.
2. RAM access 2 is not available in Voice/Audio Codec Modes (CONF = 90h, 92h, and 94h).
ACCx = 0
Start Write
Store relevant access code in
ADDx , AREXx, SBADxM and
SBADxL
B1A = 1 (x = 1) or
B2A = 1 (x = 2)?
CRx, IOx, and SBRAMx = 0 or 1
as appropriate
WRTx = 1
YDAMx = MSB
YDALx = LSB
ACCx = 1
More to write?
End Write
Yes
Yes
ACCx = 0
ACCx = 0
No
No
No
No
Figure 4-1. Host Flowchart - RAM Data Read and RAM Data Write
Summary of Contents for RFX144V24-S23
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