Essi data path programming model (shfd = 1) -32, Figure 7-13 . the, And figure 7-13 . dat – Motorola DSP56301 User Manual
Page 230
ESSI Programming Model
7
-32
DSP56301 User’s Manual
Figure 7-13. ESSI Data Path Programming Model (SHFD = 1)
SRD
ESSI Receive Data
Register (Read Only)
ESSI Receive
Shift Register
24-bit Data
0
0
0
16-bit Data
12-bit Data
8-bit Data
LSB
LSB
LSB
LSB
MSB
MSB
MSB
MSB
Least Significant
Zero Fill
(a) Receive Registers
STD
ESSI Transmit Data
Register
(Write Only)
ESSI Transmit Shift
Register
24 Bit
WL1, WL0
24-bit Data
0
0
0
16-bit Data
12-bit Data
8-bit Data
LSB
LSB
LSB
LSB
MSB
MSB
MSB
MSB
Least Significant
Zero Fill
16 Bit
12 Bit
8 Bit
(b) Transmit Registers
Receive High Byte
Receive Middle Byte
Receive Low Byte
Receive High Byte
Receive Middle Byte
Receive Low Byte
23
16 15
8 7
0
23
16 15
7
0
7
0 7
7
0
7
0 7
0 7
0
Note:
Data is received MSB first if SHFD = 0.
24-bit fractional format (ALC = 0).
32-bit mode is not shown.
Transmit High Byte
Transmit Middle Byte
Transmit Low Byte
Transmit High Byte
Transmit Middle Byte
Transmit Low Byte
23
16 15
8 7
0
23
16 15
7
0
7
0 7
7
0
7
0 7
0 7
0
Note:
Data is received MSB first if SHFD = 0.
4-bit fractional format (ALC = 0).
32-bit mode is not shown.
0
0
0
0