Figure 7-6 Essi Control Register A (Cra) (Essi0 X:$Ffffb5, Essi1 X:$Ffffa5); Figure 7-7 Essi Control Register B (Crb) (Essi0 X:$Ffffb6, Essi1 X:$Ffffa6); Figure 7-8 Essi Status Register (Ssisr) (Essi0 X:$Ffffb7, Essi1 X:$Ffffa7); Essi Programming Model - Motorola DSP56305 User Manual

7.4

ESSI PROGRAMMING MODEL

The ESSI is composed of:
• Two control registers (CRA, CRB)
• One status register (SSISR)
• Three transmit data registers (TX0, TX1, TX2)
• One receive data register (RX)
• Two transmit slot mask registers (TSMA, TSMB)
• Two receive slot mask registers (RSMA, RSMB)
• One special-purpose time slot register (TSR)
The following paragraphs give detailed descriptions and operations of each of the bits in
the ESSI registers. The GPIO functionality of the ESSI is described in Section 7.6 of this
manual.
11 10 9
PSR
23 22 21
SSC1 WL2

Figure 7-6 ESSI Control Register A (CRA) (ESSI0 X:$FFFFB5, ESSI1 X:$FFFFA5)

11 10 9
CKP FSP FSR
23 22 21
REIE TEIE RLIE

Figure 7-7 ESSI Control Register B (CRB) (ESSI0 X:$FFFFB6, ESSI1 X:$FFFFA6)

11 10 9
23 22 21

Figure 7-8 ESSI Status Register (SSISR) (ESSI0 X:$FFFFB7, ESSI1 X:$FFFFA7)

MOTOROLA
Enhanced Synchronous Serial Interface (ESSI)
8 7 6
PM7 PM6
20 19 18
WL1 WL0 ALC
8 7 6
FSL1 FSL0 SHFD
20 19 18
TLIE RIE TIE
8 7 6
RDF TDE
20 19 18
DSP56305 User's Manual
ESSI Programming Model
5 4 3
PM5 PM4 PM3
17 16 15
DC4 DC3
5 4 3
SCKD SCD2 SCD1
17 16 15
RE TE0 TE1
5 4 3
ROE TUE RFS
17 16 15
2 1 0
PM2 PM1 PM0
14 13 12
DC2 DC1 DC0
AA0857
2 1 0
SCD0 OF1 OF0
14 13 12
TE2 MOD SYN
AA0858
2 1 0
TFS IF1 IF0
14 13 12
AA0859
7-13