Enhanced Synchronous Serial Interface (ESSI)
ESSI Programming Model
MOTOROLA
DSP56305 User’s Manual
7-19
7.4.1.7
Word Length Control (WL[2:0]) CRA Bits 21-19
The WL[2:0] bits are used to select the length of the data words being transferred via the
ESSI. Word lengths of 8-, 12-, 16-, 24-, or 32- bits may be selected (see Table 7-2). The
ESSI data path programming model in Figure 7-19 and Figure 7-20 has additional
information on selecting different length data words. The ESSI data registers are 24 bits
long. The ESSI transmits 32-bit words either by duplicating the last bit 8 times when
WL[2:0] = 100, or by duplicating the first bit 8 times when WL[2:0] = 101. The WL[2:0]
bits are cleared by a hardware reset signal or by a software reset instruction.
7.4.1.8
Select SC1 as Transmitter 0 Drive Enable (SSC1) CRA Bit 22
The SSC1 bit controls SC1 signal functionality (see Figure 7-4). If SSC1 = 1, and the
following three conditions hold: the ESSI is configured in Synchronous mode (SYN = 1),
transmitter 2 is disabled (TE2 = 0), and the SC1 signal is configured as output (SCD1 = 1),
then the SC1 signal is the driver enable for transmitter 0. This enables the use of an
external buffer for the transmitter 0 output. If SSC1 = 0, and the same three conditions
hold: the ESSI is configured in Synchronous mode (SYN = 1), transmitter 2 is disabled
(TE2 = 0), and the SC1 signal is configured as output (SCD1 = 1), then the SC1 signal is
the serial I/O flag. The reset value is cleared.
7.4.1.9
Reserved CRA Bit 23
This bit is reserved. It is read as 0 and should be written with 0.
Table 7-2
ESSI Word Length Selection
WL2
WL1
WL0
Number of Bits/Word
0
0
0
8
0
0
1
12
0
1
0
16
0
1
1
24
1
0
0
32
(valid data in the first 24 bits)
1
0
1
32
(valid data in the last 24 bits)
1
1
0
Reserved
1
1
1
Reserved
Summary of Contents for DSP56305
Page 34: ...xxxii DSP56305 User s Manual MOTOROLA ...
Page 40: ...xxxvi DSP56305 User s Manual MOTOROLA ...
Page 41: ...MOTOROLA DSP56305 User s Manual 1 1 SECTION 1 DSP56305 OVERVIEW ...
Page 58: ...1 18 DSP56305 User s Manual MOTOROLA DSP56305 Overview DSP56305 Architecture Overview ...
Page 59: ...MOTOROLA DSP56305 User s Manual 2 1 SECTION 2 SIGNAL CONNECTION DESCRIPTIONS ...
Page 98: ...2 40 DSP56305 User s Manual MOTOROLA Signal Connection Descriptions JTAG OnCE Interface ...
Page 99: ...MOTOROLA DSP56305 User s Manual 3 1 SECTION 3 MEMORY CONFIGURATION ...
Page 119: ...MOTOROLA DSP56305 User s Manual 4 1 SECTION 4 CORE CONFIGURATION ...
Page 144: ...4 26 DSP56305 User s Manual MOTOROLA Core Configuration JTAG Boundary Scan Register BSR ...
Page 145: ...MOTOROLA DSP56305 User s Manual 5 1 SECTION 5 GENERAL PURPOSE I O ...
Page 149: ...HOST INTERFACE HI32 MOTOROLA DSP56305 User s Manual 6 1 SECTION 6 HOST INTERFACE HI32 ...
Page 150: ...6 2 DSP56305 User s Manual MOTOROLA HOST INTERFACE HI32 ...
Page 259: ...MOTOROLA DSP56305 User s Manual 7 1 SECTION 7 ENHANCED SYNCHRONOUS SERIAL INTERFACE ESSI ...
Page 315: ...MOTOROLA DSP56305 User s Manual 8 1 SECTION 8 SERIAL COMMUNICATION INTERFACE SCI ...
Page 347: ...MOTOROLA DSP56305 User s Manual 9 1 SECTION 9 TIMER EVENT COUNTER ...
Page 376: ...9 30 DSP56305 User s Manual MOTOROLA Timer Event Counter Timer Modes of Operation ...
Page 377: ...MOTOROLA DSP56305 User s Manual 10 1 SECTION 10 ON CHIP EMULATION MODULE ...
Page 411: ...MOTOROLA DSP56305 User s Manual 11 1 SECTION 11 JTAG PORT ...
Page 430: ...11 20 DSP56305 User s Manual MOTOROLA JTAG Port DSP56305 Boundary Scan Register ...
Page 431: ...Filter Co Processor MOTOROLA DSP56305 User s Manual 12 1 SECTION 12 FILTER CO PROCESSOR ...
Page 471: ...VITERBI CO PROCESSOR MOTOROLA DSP56305 User s Manual 13 1 SECTION 13 VITERBI CO PROCESSOR ...
Page 522: ...13 52 DSP56305 User s Manual MOTOROLA VITERBI CO PROCESSOR References ...
Page 554: ...14 32 DSP56305 User s Manual MOTOROLA CYCLIC CODE CO PROCESSOR Configuration Examples ...
Page 555: ...MOTOROLA DSP56305 User s Manual A 1 APPENDIX A BOOTSTRAP CODE ...
Page 568: ...A 14 DSP56305 User s Manual MOTOROLA Bootstrap Code ...
Page 569: ...Equates MOTOROLA DSP56305 User s Manual B 1 APPENDIX B EQUATES ...
Page 589: ...MOTOROLA DSP56305 User s Manual C 1 APPENDIX C JTAG BSDL ...
Page 590: ...C 2 DSP56305 User s Manual MOTOROLA JTAG BSDL ...
Page 600: ...C 12 DSP56305 User s Manual MOTOROLA JTAG BSDL ...
Page 601: ...MOTOROLA DSP56305 User s Manual D 1 APPENDIX D PROGRAMMING REFERENCE ...
Page 602: ...D 2 DSP56305 User s Manual MOTOROLA PROGRAMMING REFERENCE ...
Page 661: ...Y MOTOROLA DSP56305 User s Manual Index 11 ...
Page 662: ...Y Index 12 DSP56305 User s Manual MOTOROLA ...