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RISC Microcode from RAM
C-7
MC68360 USER’S MANUAL
Reception of frames with only one “shared” flag.
Automatic generation and stripping of transparency characters according to the Internet
Engineering Task Force RFC 1549 utilizing transmit and receive control character
maps.
Automatic transmission of the ABORT sequence (0x7D,0x7E) after the STOP TRANS-
MIT command is issued.
Automatic transmission of IDLE characters between frames and characters.
Consumes 768 bytes of the QUICC’s internal memory.
C.4.2 Performance
At 25Mhz, an aggregate Asynchronous HDLC bandwidth of 3 Mbps divided among the 4
SCCs consumes 100% of the processing power of the RISC communications engine. If only
a percentage of the total available Asynchronous HDLC bandwidth is used, the remaining
RISC processing power can be used to run other protocols on other channels. Table C-4
shows the AHDLC configuration
C.5 PROFIBUS CONTROLLER
Process field bus (PROFIBUS) is a UART- based master slave protocol that specific data
between 9.6 kbps to 1.525 Mbps. The PROFIBUS protocol is mainly used in industrial pro-
cess control applications. The protocol is defined in the German DIN standard 19 245.
The PROFIBUS microcode running on the QUICC RISC controller assists the core in han-
dling some of the time-critical PROFIBUS link layer functions, leaving more of the core avail-
able for the application software.
C.5.1 Key Features
Frame preceding IDLE sequence generation/checking
Flexible Frame Oriented Data Buffers
Separate interrupts for Frames and Buffers (Receive and Transmit)
Maintenance of six 16-bit error counters
Two Address Comparison Registers with Mask
Frame Error, Noise Error, Parity Error Detection
Detection of IDLE in middle of a frame
Check Sum generation/checking
Table C-4. AHDLC Configuration
AHDLC Channels
Risc Bandwidth
Consumed (est)
Possible Configuration of Other Channels
1 x 115 Kbit/s
4%
1 x 10Mbit Ethernet, 2 x 1.5 Mbit HDLC, 9.6 Kbit SMC UART
2 x 230 Kbit/s
15%
1 x 10Mbit Ethernet, 1 x 1.5 Mbit HDLC, 9.6 Kbit SMC UART
3 x 230 Kbit/s
24%
1 x 5Mbit HDLC, 2 x 9.6 Kbit SMC UART
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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