Mesa 7I76, Руководство пользователя

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7I76 25
REFERENCE INFORMATION
SSLBP
PER CHANNEL INTERFACE DATA REGISTERS
SSLBP supports three 32 bit interface data registers per channel. These are called
interface register 0, interface register 1, and interface register 2. These are read/write
registers with independent incoming and outgoing data. These registers are used for both
setup/discovery data when starting a data link and process data once the link is running.
When a start command is issued and has successfully completed, per channel setup data
will be available in the interface registers.
PER CHANNEL CONTROL AND STATUS REGISTERS
SSLBP has a 32 bit control and status register for each channel. Like the interface
data registers, these registers are used both for data link startup information and for status
when the link is in operation.
REMOTE MODES
Some remote devices have software selectable modes that determine the specific
data transferred for each DOIT command. These modes are selected by writing the mode
number to the most significant byte of the remote channels CSR before a START or
SETUP START command is issued. A default value of 0x00000000 should be written to
all CSRs if MODE is not used.
REMOTE MODE IS WRITTEN TO CSR MS BYTE BEFORE START
CS REG MODE 0 0 0.
INTERFACE AND CS REGISTER DATA AT START
After a successful start command (either setup start or normal start), Interface register 0
reports the remote device’s unit number. This is the number printed on the card label. Interface
register 1 reports the remote device’s 4 letter name (LSB first). Interface register 2 reports the
remote devices global table of contents pointer (GTOCP) and process table of contents pointer
(PTOCP) for the currently selected remote device mode. The GTOCP and PTOCP will be 0x0000
for devices that do not support process data discovery. Note that the setup data will be overwritten
with process data once the first DOIT command is issued.
READ DATA FROM PER CHANNEL INTERFACE REGISTERS AFTER START
CS REG
X COM_STATE STATUS LOCAL FLT.
INTERFACE 0
UNIT# BYTE 3 UNIT# BYTE 2 UNIT# BYTE 1 UNIT# BYTE 0
INTERFACE 1
NAME BYTE 3 NAME BYTE 2 NAME BYTE 1 NAME BYTE 0
INTERFACE 2
GTOCP BYTE1 GTOCP BYTE 0 PTOCP BYTE1 PTOCP BYTE 0