TC1796
Peripheral Units (Vol. 2 of 2)
Micro Link Interface (MLI)
User’s Manual 23-15 V2.0, 2007-07
MLI, V2.0
23.1.2.5 Discrete Read Frame
A Discrete Read Frame is used by the Local Controller to request data to be read from
the Remote Window in the Remote Controller. If the data is available, the Remote
Controller typically responds to this request by sending an Answer Frame with the
requested read data back to the Local Controller.
The Discrete Read Frame contains the following parts:
• Header:
The header starts with frame code FC = 01
B
followed by the pipe number PN of the
Transfer Window that has been the target of the read operation.
• m-Bits of write offset:
These bits define the read offset. The value of m depends on the size of the Remote
Window, defined by the Copy Base Address Frame (m = 1-16).
• Data Width DW:
The data width DW indicates if the read from the Transfer Window was a 8-bit, 16-
bit, or 32-bit read action. It defines how many bytes have to be delivered to the Local
Controller by the Answer Frame.
• Parity bit P
Figure 23-12 Discrete Read Frame
More details on the Discrete Read Frame handling of the MLI module are described on
Page 23-32.
Table 23-3 Data Width DW Coding
Data Width DW Number of Data Bits to be transferred
00
B
8-bit read access
01
B
16-bit read access
10
B
32-bit read access
11
B
reserved for future use
MCA05881_mod
PN PDW01 m-Bit Offset Address
Header
02 6+m314
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