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參數(shù)資料
| 型號： | MC68HC55CD |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4 CHANNEL(S), SERIAL COMM CONTROLLER, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 25/40頁 |
| 文件大?。?/td> | 284K |
| 代理商： | MC68HC55CD |
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MC68HC55 Technical Data
CRC Computation
MC68HC55
Technical Data
Functional Description
31
4.7 CRC Computation
The 4-bit CRC uses an initialization value of 1010 and a polynomial of
x4+1. The following is a VHDL description of the CRC algorithm.
---------------------------------------------------------
-- Calculates the 4-bit CRC (x^4 + 1) serially for
-- 8 or 16 bits of data.
---------------------------------------------------------
constant CRCPoly: std_logic_vector := “0001”; -- x^4 +1
constant InitCrc: std_logic_vector := “1010”;
procedure SerialCalculateCRC4(CRC: input std_logic_vector;Data: in std_logic) is
variable Xor1: std_logic;
begin
Xor1 := CRC(3) xor Data;
CRC := CRC(2 downto 0) & ‘0’; -- Shift left 1 bit
if Xor1 = ‘1’ then
CRC := CRC xor CRCPoly
end if;
end SerialCalculateCRC4;
4.8 Message Size Special Cases
The response to any 8-bit message is expected to be another 8-bit
message and the response to any 16-bit message is expected to be
another 16-bit message. All DSI messages are initiated by the master
MCU through the DSI/D. This cuases to some special cases when there
is a transition from one message size to a different message size. The
first DSI messages that set up the addresses of the DSI system
peripherals are 16-bit messages. The firing commands are also 16-bit
messages. All other messages are eight bits.
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