Cirrus Logic EP93xx - Manual (Page 697)

DS785UM1 22-9
Copyright 2007 Cirrus Logic
AC’97 Controller
EP93xx User’s Guide
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RSIZE: Determines how many bits to a data word. See Table 22-3
for details of the interaction between RSIZE and CM.
00 data is 16 bits
01 data is 18 bits
10 data is 20 bits
11 data is 12 bits
RX12: FIFO stores SLOT12 data (takes precedence over
AC97S12Data)
RX11: FIFO stores SLOT11 data
RX10: FIFO stores SLOT10 data
RX9: FIFO stores SLOT9 data
RX8: FIFO stores SLOT8 data
RX7: FIFO stores SLOT7 data
RX6: FIFO stores SLOT6 data
RX5: FIFO stores SLOT5 data
RX4: FIFO stores SLOT4 data
RX3: FIFO stores SLOT3 data
RX2: FIFO stores SLOT2 data
RX1: FIFO stores SLOT1 data
REN: A “1” written to this bit enables the receive for this FIFO
and enables the PCLK for the respective channel.
Table 22-3. Interaction Between RSIZE and CM
CM RSIZE Data to CPU
0 0 0 Justified, one 16 bits
0 1 1 Justified, one 12 bits
1 0 0 Compacted, two 16 bits
1 1 1 Compacted, two 12 bits
X 1 0 Justified, 20 bit
X 0 1 Justified, 18 bit