DSP56303 datasheet(161/292 Pages) FREESCALE

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ESSI Programming Model

DSP56303 User’s Manual, Rev. 2

Freescale Semiconductor

7-29

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.

Figure 7-12. ESSI Data Path Programming Model (SHFD = 0)

SRD

ESSI Receive Data

Serial

Receive

Shift

24 Bit

WL1, WL0

24-bit Data

16-bit Data

12-bit Data

8-bit Data

LSB

MSB

Least Significant

Zero Fill

NOTES:

Data is received MSB first if SHFD = 0.

24-bit fractional format (ALC = 0).

32-bit mode is not shown.

16 Bit

12 Bit

8 Bit

(a) Receive Registers

STD

ESSI Transmit Data

ESSI Transmit

Shift Register

24-bit Data

16-bit Data

12-bit Data

8-bit Data

LSB

Least Significant

Zero Fill

(b) Transmit Registers

Transmit High Byte

Transmit Middle Byte

Transmit Low Byte

Transmit High Byte

Transmit Middle Byte

Transmit Low Byte

16 15

8 7

16 15

70 7

0 7

MSB

NOTES:

Data is transmitted MSB first if

SHFD = 0. 4-bit fractional format (ALC = 0).

32-bit mode is not shown.

Receive High Byte

Receive Middle Byte

Receive Low Byte

Receive High Byte

Receive Middle Byte

Receive Low Byte

16 15

70 7

0 7

MSB

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