XM014034B datasheet(26/83 Pages) XMOS

26 / 83 page

XU6--QF6A Datasheet

TDI

TDO

TCK

TMS

BS TAP

TDI

TDO

Figure

JTAG chain

structure

-bit DR. It also provides access to a chip TAP that in turn can access the xCORE Tile

for loading code and debugging.

The JTAG module can be reset by holding TMS high for ve clock cycles.

The JTAG device identication register can be read by using the IDCODE instruction. Its

contents are specied in Figure

Bit

Device Identication Register

Bit

Version

Part Number

Manufacturer Identity

Figure

IDCODE return

value

The JTAG usercode register can be read by using the USERCODE instruction. Its con-

tents are specied in Figure 6. The OTP User ID eld is read from bits [:] of the

OTP_JTAG_USER_WORD on xCORE Tile , see Section . (all zero on unprogrammed

devices). The OTP User ID eld is set by the boot ROM when it executes after the device

reset has been de-asserted, so its value is not available to read when the device is in

reset.

Bit

Usercode Register

Bit

OTP User ID

Silicon Revision

Figure 6:

USERCODE

return value

You can program the PLL and reset the device over JTAG. When IR is set to eight, the DR

value is shifted directly into the PLL settings register (Appendix D. ), which includes bits

for resetting the device and for setting the “boot-from-JTAG” bit. Note that if TCK is not

free running then at least

TCK clocks must be provided after shifting the value into

DR for the write to take effect.

XM014034B Datasheet(PDF) 26 Page - Xmos Ltd.

XM014034B Datasheet(HTML) 26 Page - Xmos Ltd.

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