GR712RC-UM, Jun 2017, Version 2.9 86 www.cobham.com/gaisler
GR712RC
10.3 Registers
The core does not implement any registers mapped in the AMBA AHB or APB address space.
10.4 Signal definitions
The signals are described in table 47.
NOTE: for correct operation, all JTAG signals should be pulled-up externally with 10kOhm. The
GR712RC does not include any internal pull-ups. This is in line with the TAP specification where
TMS and TDI implementation should be such that if an external signal fails (e.g. open circuit) then
the behavior of TMS and TDI should be equivalent to a logical 1 input. Since TCK is not switching,
the JTAG interface will effectively be disabled.
32 Sequential transfer (SEQ) - If ‘1’ is shifted in this bit position when read data is shifted out or write
data shifted in, the subsequent transfer will be to next word address.
31 30 AHB Data - AHB write/read data. For byte and half-word transfers data is aligned according to big-
endian order where data with address offset 0 data is placed in MSB bits.
Table 47. Signal definitions
Signal name Type Function Active
TCK Input JTAG clock -
TMS Input JTAG TMS High
TDI Input JTAG TDI High
TDO Output JTAG TDO High
Table 46. JTAG debug link Data register
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