Xconnect Links - XMOS sliceKIT Hardware Manual

sliceKIT hardware manual
then transition from low to high to latch the selection. The SPI selection state is
maintained until the system is reset.
Once this sequence is completed and the selection has been latched, X0D42 and
X0D43 return to performing their normal functions in the Triangle slot.
If the SPI is not disabled, then SliceCARDs in the Star slot may not function as
expected. If there is no sliceCARD in the Star slot, then it does not matter whether
the SPI has been disabled or not. Therefore, applications which require runtime
access to the SPI flash should either leave the Star slot unpopulated or check to
ensure that the sliceCARD which is in the slot will be unaffected by the operation
of the flash device.
The xTAG-2 system can use the boot mode select signal to force all devices in the
chain (master and slave core boards) to boot from JTAG (don't boot) for debug
purposes.
If not in this mode, the devices will boot from SPI or xCONNECT Link as appropriate.

2.6 xCONNECT Links

The Chain connector contains two 5-bit xCONNECT Links, XLA and XLB, which can
be used to chain sliceKIT core boards together. The links from Tile 0 are connected
REV A
Reset
D42 = 0
D43 = X
SPI = EN
Boot
D42 = 0
D43 = X
SPI = EN
Disable
D42 =
D43 = 1
SPI = DIS
D42, D43, D0
D1, D10, D11
available
Enable
D42 =
D43 = 0
SPI = EN
D42, D43 available;
D0, D1, d10, D11
used by SPI
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