DSP56309EVM Freescale Semiconductor, DSP56309EVM Datasheet - Page 133

• Manufacturer Part Number: DSP56309EVM
• Description: KIT EVALUATION FOR XC56309
• Manufacturer: Freescale Semiconductor
• Type: DSPr

Specifications of DSP56309EVM

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Description/function: Audio DSPs
• Product: Audio Modules
• For Use With/related Products: DSP56309
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Enhanced Synchronous Serial Interface
(ESSI)
The ESSI provides a full-duplex serial port for serial communication with a variety of serial
devices, including one or more industry-standard codecs, other DSPs, microprocessors, and
peripherals. The ESSI consists of independent transmitter and receiver sections and a common
ESSI clock generator. There are two independent and identical ESSIs in the DSP56309: ESSI0
and ESSI1. For simplicity, a single generic ESSI is described here. The ESSI block diagram is
shown in Figure 7-1. This interface is synchronous because all serial transfers are synchronized
to one clock.
This synchronous interface should not be confused with the asynchronous channels mode of the
ESSI, in which separate clocks are used for the receiver and transmitter. In that mode, the ESSI is
still a synchronous device because all transfers are synchronized to these clocks. Pin notations for
the generic ESSI refer to the analogous pin of ESSI0 (
Freescale Semiconductor
Interrupts
Clock/Frame Sync Generators and Control Logic
Figure 7-1. ESSI Block Diagram
DSP56309 User’s Manual, Rev. 1
RSMB
SSISR
RSMA
TSMA
TSMB
CRB
CRA
TSR
GDB
DDB
RCLK
TCLK
PCx
) and ESSI1 (
RX SHIFT REG
TX2 SHIFT
TX0 SHIFT REG
TX1 SHIFT REG
TX0
TX2
TX1
RX
PDx
STD
SC0
SC1
SC2
SCK
SRD
).
7
7-1