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Preliminary
Page 14 of 14
SMT327 User Guide
Document Name:
User Guide
Issue : 01
Rev 02
Product Name:
SMT327
Revision Date:
8 August, 2000
Author:
Bill Blyth
Original Date:
30 April 1998
9. Registers
In target mode, the SMT327 is accessed by a host device across the PCI bus. This allows access to the
target mode registers. The operating system or BIOS will normally allocate a base address for the target
mode registers of each SMT327. Access to each register within the SMT327 is then specified by this
base address and the offset shown in the table below.
The I/O address space is decoded as shown in the table below.
Offset
Register(Write)
Register(Read)
Width
0
-
-
+4
-
-
+8
-
-
+0C
-
-
+10
COMPORT_OUT
COMPORT_IN
32
+14
CONTROL
STATUS
32
+18
INT_CONTROL
32
+1C
-
-
+20 to +3F
Not used
Not used
+40 to +7E
Mailbox Write
Mailbox Read
32
+80 to +AF
TBC Write
TBC Read
16
9.1 Comport Registers (Offset 10h)
The host is connected to the first TIM site using comport 3. This port is bi-directional and will
automatically switch direction to meet a request from either the host or the C40. Both input and output
registers are 32 bits wide. Data can only be written to COMPORT_OUT when STATUS[OBF] is 0. Data
received from the C40 is stored in COMPORT_IN and STATUS[IBF] is set to 1. Reading COMPORT_IN
will clear STATUS[IBF] and allow another word to be received from the C40.