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LEXTx
Specifies word size for each link buffer:
LEXTx=1 specifies 48-bit transfers in link buffer x
LEXTx=0 specifies 32-bit transfers in link buffer x
Link buffer data is transmitted and received MSB-first. LEXTx
must not be changed while that link buffer is enabled, as this will
cause the nibble packing to initialize to an incorrect value.
The LEXTx bits override the setting of the IMDW memory word
width bits in SYSCON. If LEXTx=1, data to be transmitted will
be read from 48-bit word space in memory, regardless of the
setting of IMDW.
Note that when link buffers are enabled or disabled, it is possible to
generate unwanted interrupt service requests. This can occur if Link
Service Requests (LSRQ) are in use. To avoid this potential problem, the
LSRQ register should be masked out while the link buffers are being
enabled or disabled. See the "Link Port Interrupts" section of this chapter
for more information.
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Link Ports
9
9 – 7
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