DSP56303 datasheet(162/292 Pages) FREESCALE

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DSP56303 User’s Manual, Rev. 2

7-30

Freescale Semiconductor

Enhanced Synchronous Serial Interface (ESSI)

Figure 7-13. ESSI Data Path Programming Model (SHFD = 1)

ESSI Receive Data

ESSI Receive

Shift Register

24-bit Data

16-bit Data

12-bit Data

8-bit Data

LSB

MSB

Least Significant

Zero Fill

(a) Receive Registers

ESSI Transmit Data

(Write Only)

ESSI Transmit Shift

24 Bit

WL1, WL0

24-bit Data

16-bit Data

12-bit Data

8-bit Data

LSB

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

16 15

70 7

0 7

NOTES:

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

16 15

8 7

16 15

70 7

0 7

NOTES:

Data is received MSB first if SHFD = 0.

4-bit fractional format (ALC = 0).

32-bit mode is not shown.

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