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TC1784
FlexRay™ Protocol Controller (E-Ray)
User´s Manual
20-6
V1.1, 2011-05
E-Ray, V3.13
Service Request Control (INT)
The Service Request Controller performs the following functions:
•
Provides error and status service request flags
•
Enables and disables service request sources
•
Assignment of service request sources to one of the two module service request lines
•
Enables and disables module service request lines
•
Manages the two service request timers
•
Stop watch time capturing
20.5
Programmer’s Model
The programmer’s model of the E-Ray module follows the principle of memory mapped
peripheral. Some portion of the memory follows the principle of segmented/paged
memory organization.
20.5.1
Register Map
The E-Ray module allocates an address space of 4 Kbyte (000
H
to FFFF
H
). The registers
are organized as 32-bit registers. 8/16-bit accesses are also supported. Host access to
the Message RAM is done via the Input and Output Buffers. They buffer data to be
transferred to and from the Message RAM under control of the Message Handler,
avoiding conflicts between Host accesses and message reception / transmission.
Addresses 0004
H
- 000F
H
,03C8
H
- 03EC
H
and 0800
H
- 0FFF
H
are reserved for customer
specific purposes. All functions related to these addresses are located in the Customer
Host Interface. The test registers located on address 0010
H
and 0014
H
are writable only
under the conditions described in
“Special Registers” on Page 20-23
.
The assignment of the Message Buffers is done according to the scheme shown in
below. The number N of available Message Buffers depends on the payload
length of the configured Message Buffers. The maximum number of Message Buffers is
128. The maximum payload length supported is 254 byte.
The Message Buffers are separated into three consecutive groups:
•
Static Buffers: Transmit / Receive Buffers assigned to static segment
•
Static and Dynamic Buffers: Transmit / Receive Buffers assigned to static or dynamic
segment
•
FIFO- Receive FIFO
The Message Buffer separation configuration can be changed only in
“DEFAULT_CONFIG” or “CONFIG” state only by programming the Message RAM
Configuration register (MRC).
The first group starts with Message Buffer 0 and consists of static Message Buffers only.
Message Buffer 0 is dedicated to hold the startup / SYNC Frame or the single slot Frame,
if node transmit one, as configured by SUCC1.TXST, SUCC1.TXSY, and SUCC1.TSM
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