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DSP56305 User’s Manual
MOTOROLA
Enhanced Synchronous Serial Interface (ESSI)
ESSI Programming Model
7.4.2.12
ESSI Mode Select (MOD) CRB Bit 13
MOD selects the operational mode of the ESSI (see Figure 7-18). When MOD is cleared,
the Normal mode is selected; when MOD is set, the Network mode is selected. In the
Normal mode, the frame rate divider determines the word transfer rate: one word is
transferred per frame sync during the frame sync time slot. In Network mode, a word
may be transferred every time slot. For more details, see
Section 7.5
. Either a hardware
reset signal or a software reset instruction will clear MOD.
Figure 7-17
CRB SYN Bit Operation
External Frame SYNC
SC1
Asynchronous (SYN = 0)
Transmitter
Clock
Frame
SYNC
RECEIVER
Clock
Frame
SYNC
SRD
STD
SC2
External Transmit Frame SYNC
External Receive Frame SYNC
Internal Frame SYNC
SC0
SCK
External Transmit Clock
External Receive Clock
Internal Clock
ESSI Bit
Clock
NOTE: Transmitter and receiver may have different clocks and frame syncs.
SYNCHRONOUS (SYN = 1)
Transmitter
Clock
Frame
SYNC
Receiver
Clock
Frame
SYNC
SRD
STD
SC2
Internal Frame SYNC
SCK
External Clock
Internal Clock
ESSI Bit
Clock
NOTE: Transmitter and receiver may have the same clock frame syncs.
AA0682
Содержание DSP56305
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Страница 146: ...5 2 DSP56305 User s Manual MOTOROLA General Purpose I O 5 1 Introduction 5 3 5 2 Programming Model 5 3 ...
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