SuperH (SH) 64-bit RISC Series SH-5 System Architecture, Volume ...

PRELIMINARY DATA
SHdebug link 201
3.2.2 Protocol levels
The SHdebug link has two protocol levels in each direction:
• A low-level protocol which provides start-of-message indication, end-of-message
indication and flow control. At this level, message input and message output are
completely independent and messages can flow in both directions at the same
time.
• A higher-level protocol which identifies the message contents and specifies the
response required to each request. Certain message types, that is, trace
messages from SH-5 are output-only and require no response from the tool.
The protocol is encoded little endian.
3.2.3 External pins
The SHdebug link interface pins are described in Table 71.
Signal Lines Type
Internal
pull-up
Description
DM_CLKIN 1 IN_TBD Yes Clock from debug adapter, in
phase with DM_IN and DM_ISYNC.
DM_CLKOUT 1 OUT_TBD No SHdebug link clock source.
DM_OUT[0,3] 4 OUT_TBD No Output data, synchronous to the
rising edge of DM_CLKOUT.
DM_OSYNC 1 OUT_TBD No Output sync, synchronous to the
rising edge of DM_CLKOUT.
DM_IN 1 IN_TBD Yes Input data, synchronous to the
rising edge of DM_CLKIN.
D R A FT
DM_ISYNC 1 IN_TBD Yes Input sync, synchronous to the
rising edge of DM_CLKIN.
DM_TRIN_N 1 IN_LVTTL Yes Trigger input.
DM_TROUT_N 1 OUT_LVTTL No Trigger output.
Table 71: SHdebug link external pins
05-SA-10003 v1.0
SuperH, Inc.
SH-5 System Architecture, Volume 3: Debug