DSP56303 FREESCALE [Freescale Semiconductor, Inc], DSP56303 Datasheet - Page 161

• Manufacturer Part Number: DSP56303
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

unused. Unused bits are read as 0. Data shifts out of these registers MSB first if the SHFD bit is
cleared and LSB first if SHFD is set.
Freescale Semiconductor
Register
Receive
Serial
STD
Shift
23
23
7
7
(a) Receive Registers
23
23
(b) Transmit Registers
7
7
Figure 7-12. ESSI Data Path Programming Model (SHFD = 0)
Receive High Byte
Receive High Byte
MSB
MSB
MSB
MSB
MSB
MSB
MSB
MSB
Transmit High Byte
Transmit High Byte
8-bit Data
8-bit Data
12-bit Data
12-bit Data
16-bit Data
LSB
16-bit Data
16 15
16 15
LSB
0 7
0 7
16 15
16 15
0 7
0 7
DSP56303 User’s Manual, Rev. 2
Receive Middle Byte
Receive Middle Byte
Transmit Middle Byte
Transmit Middle Byte
0
0
24-bit Data
LSB
24-bit Data
LSB
0
0
LSB
LSB
8 7
0 7
0
8
0
0
0 7
8 7
7
7
7
7
16 Bit
12 Bit
8 Bit
Receive Low Byte
Receive Low Byte
NOTES:
Data is transmitted MSB first if
SHFD = 0. 4-bit fractional format (ALC = 0).
32-bit mode is not shown.
Transmit Low Byte
Transmit Low Byte
WL1, WL0
NOTES:
Data is received MSB first if SHFD = 0.
24-bit fractional format (ALC = 0).
32-bit mode is not shown.
0
0
LSB
LSB
0
0
0
0
0
0
0
ESSI Receive Data
Register
0
ESSI Transmit
ESSI Transmit Data
Register
Shift Register
Least Significant
Zero Fill
ESSI Programming Model
Least Significant
Zero Fill
24 Bit
SRD
7-29