Enhanced Synchronous Serial Interface (ESSI)
ESSI Programming Model
MOTOROLA
DSP56309UM/D 7-13
7.4.1.5
CRA Reserved Bit 17
This bit is reserved. It is read as 0 and should be written with 0.
7.4.1.6
CRA Alignment Control (ALC) Bit 18
The ESSI is designed for 24-bit fractional data. Shorter data words are left aligned to the
MSB, Bit 23. For applications that use 16 bit fractional data, shorter data words are left
aligned to bit 15. The ALC bit supports shorter data words. If ALC is set, received words
are left aligned to bit 15 in the receive shift register. Transmitted words must be left
aligned to bit 15 in the transmit shift register. If the ALC bit is cleared, received words
are left aligned to bit 23 in the receive shift register. Transmitted words must be left
aligned to bit 23 in the transmit shift register. The ALC bit is cleared by either a
hardware RESET signal or a software RESET instruction
.
Note:
If the ALC bit is set, only 8-, 12-, or 16-bit words should be used. The use of
24- or 32-bit words leads to unpredictable results.
Figure 7-10
ESSI Frame Sync Generator Functional Block Diagram
Frame Sync
Transmit
Frame Sync
Receive
RX Word
Clock
TX Word
Clock
CRA(DC4:0)
Receive
Control Logic
Transmit
Control Logic
Sync
Type
Sync
Type
CRB(SYN) = 0
SYN = 1
Internal Rx Frame Sync
CRB(SCD1) = 1
SYN = 1
SCD1 = 0
SYN = 0
CRB(SCD1)
Internal TX Frame Sync
AA0680
SCn1
/1 to /32
31
0
CRB(FSL1)
CRB(FSL1:0)
CRA(DC4:0)
/1 to /32
31
0
SCn2
CRB(SCD2)
Flag1 Out,
(Sync Mode)
CRB(OF1)
CRB(TE2)
TX #2,
or drive enb.
CRA(SSC1)
Flag1 In
SSISR(IF1)
(Sync Mode)
CRB(FSR)
Sync:
TX #2,
Async:
RX F.S.
Flag1, or
drive enb.
Sync:
TX/RX F.S.
Async:
TX F.S.
CRB(FSR)
These signals are
identical in sync mode.
Содержание DSP56309
Страница 25: ...xxii DSP56309UM D MOTOROLA Figure D 25 Port E Registers PCRE PRRE PDRE D 39 ...
Страница 30: ...MOTOROLA DSP56309UM D 1 1 SECTION 1 DSP56309 OVERVIEW ...
Страница 47: ...1 18 DSP56309UM D MOTOROLA DSP56309 Overview DSP56309 Architecture Overview ...
Страница 48: ...MOTOROLA DSP56309UM D 2 1 SECTION 2 SIGNAL CONNECTION DESCRIPTIONS ...
Страница 85: ...2 38 DSP56309UM D MOTOROLA Signal Connection Descriptions OnCE JTAG Interface ...
Страница 86: ...MOTOROLA DSP56309UM D 3 1 SECTION 3 MEMORY CONFIGURATION ...
Страница 104: ...MOTOROLA DSP56309UM D 4 1 SECTION 4 CORE CONFIGURATION ...
Страница 124: ...MOTOROLA DSP56309UM D 5 1 SECTION 5 GENERAL PURPOSE I O ...
Страница 125: ...5 2 DSP56309UM D MOTOROLA General Purpose I O 5 1 INTRODUCTION 5 3 5 2 PROGRAMMING MODEL 5 3 ...
Страница 128: ...MOTOROLA DSP56309UM D 6 1 SECTION 6 HOST INTERFACE HI08 ...
Страница 166: ...MOTOROLA DSP56309UM D 7 1 SECTION 7 ENHANCED SYNCHRONOUS SERIAL INTERFACE ESSI ...
Страница 212: ...MOTOROLA DSP56309UM D 8 1 SECTION 8 SERIAL COMMUNICATION INTERFACE SCI ...
Страница 241: ...8 30 DSP56309UM D MOTOROLA Serial Communication Interface SCI GPIO Signals and Registers ...
Страница 242: ...MOTOROLA DSP56309UM D 9 1 SECTION 9 TRIPLE TIMER MODULE ...
Страница 269: ...9 28 DSP56309UM D MOTOROLA Triple Timer Module Timer Operational Modes ...
Страница 270: ...MOTOROLA DSP56309UM D 10 1 SECTION 10 ON CHIP EMULATION MODULE ...
Страница 302: ...MOTOROLA DSP56309UM D 11 1 SECTION 11 JTAG PORT ...
Страница 369: ...C 22 DSP56309UM D MOTOROLA DSP56309 BSDL Listing ...
Страница 370: ...MOTOROLA DSP56309UM D D 1 APPENDIX D PROGRAMMING REFERENCE ...
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