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Table 7-55 ICCMSR Register Bit Definitions (Continued)
Name
Bit(s)
<1:0>
ARB_CTL<1:0>
7-116 System Registers
Type
Function
R/W, 0
ARB_CTL
01
10
11
Function
Toggle 50% high/50% low mode.
The I/O port always arbitrates on
TLSB_REQ8_HIGH once, fol-
lowed by TLSB_REQ8_LOW once
for a given memory bank. This
guarantees that the I/O port wins
that memory bank at least 50% of
the time. It also guarantees that
the I/O port cannot lock out a
memory bank.
NOTE: Write Unlocks use TLSB_
REQ8_HIGH, regardless of the
previous arbitration request cycle.
Fixed low mode. The I/O port al-
ways arbitrates on TLSB_REQ8_
LOW. This guarantees that the
I/O port cannot lock out a memory
bank. However, I/O latency could
be very high. In addition, the I/O
port could potentially be locked
out from ever winning a given
memory bank due to other nodes
on the TLSB.
Fixed high mode. The I/O port al-
ways arbitrates on TLSB_
REQ8_HIGH. This guarantees
that the I/O port cannot be locked
out itself. However, it could po-
tentially cause a memory bank to
be locked out from another node
on the TLSB.
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