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Table 7-55 ICCMSR Register Bit Definitions (Continued)
Name
Bit(s)
<3:2>
SUP_CTL<1:0>
Type
Function
R/W, 0
Suppress Control. This field can be pro-
grammed to select the number of outstanding
transactions the I/O port will permit on the
TLSB before it asserts TLSB_ARB_SUP. No
node, including the I/O port, may arbitrate for
the TLSB address bus until TLSB_ARB_SUP is
deasserted. The field is defined as follows:
SUP_CTL
00
01
10
Function
Suppress after 16 transactions. If
the I/O port detects 16 outstand-
ing transactions pending on the
TLSB, it asserts TLSB_ARB_SUP
during the command/address cycle
of the 16th transaction for one cy-
cle, then deasserts it for one cycle.
It will repeat this two-cycle se-
quence until arbitration can be
permitted again, that is, when
fewer than 16 outstanding trans-
actions are pending on the TLSB.
This is the normal default mode.
Suppress after 8 transactions. If
the I/O port detects 8 outstanding
transactions pending on the TLSB,
it will assert TLSB_ARB_SUP
during the command/address cycle
of the 8th transaction for one cy-
cle, then deassert it for one cycle.
It will repeat this two-cycle se-
quence until arbitration can be
permitted again, that is, when
fewer than 8 outstanding transac-
tions are pending on the TLSB.
Suppress after 4 transactions. If
the I/O port detects 4 outstanding
transactions pending on the TLSB,
it will assert TLSB_ARB_SUP
during the command/address cycle
of the 4th transaction for one cy-
cle, then deassert it for one cycle.
It will repeat this two-cycle se-
quence until arbitration can be
permitted again, that is, when
fewer than 4 outstanding transac-
tions are pending on the TLSB.
System Registers 7-113
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