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System Service
4-107.
RIO COMMAND. Figure 4-31 shows the word format for theRIO command.
Bit 0
This bit is set if there was an error logged in the 1/0 logging array during a Read Scan
and the address of that error is specified by bits 6 through 15.
Bit 1
R/W OK-This bit contains the same information as R/W OK on a TIO.
Bit 3
Read Scan-This bit is set when a Read Scan is in process and remains set until the
completion or termination of a scan.
Bit 4
DISWEC-This bit is set if the disable error correction FF is set.
Bit 5
L/NU 128K-If bit 5
=
1, the upper 128K ELA has been selected and if bit 5
=
0, the
lower 128K ELA has been selected.
Bits 6-15
Address-This is the I/O logging array address of a logged error during a Read Scan.
NOTE
The following discussion uses the convention of placing the char-
acter N before a mnemonic or functional name to signify the
~~not"
condition.
RIO
I
I
I
I
I
I
0
1
2 3 4 5
671s
9
10
11
12
13
14
15
1
ERROR~
MSB
LSB
R/WOK
,
)
y
=0
10 BIT ADDRESS
READ SCAN
DISWEC
UU12SK
7522·50
Figure 4-31. RIO Word Format
4-108.
INTERFACING
4-109.
CTL DATA BUS. The CTL data bus provides for the transfer of data between the memory
module and the other modules on the bus via the MCUD (00-15) lines. Data parity is provided by the
MCUD PRTY line. Addressing information used to select a specific address of a word in memory is
transferred via the data lines. See figure 4-32. Control information is provided for the following
functions:
•
To select a module, TO (00-02)
•
To designate the requesting module, FROM (00-02)
4-48
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