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参数资料
型号： MC68302CRC16C
厂商： MOTOROLA INC
元件分类： 微控制器/微处理器
英文描述： 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, CPGA132
封装： PGA-132
文件页数： 73/128页
文件大小： 641K
代理商： MC68302CRC16C
ETHERNET Controller
4-10
MC68EN302 REFERENCE MANUAL
MOTOROLA
LOOP—Loopback.
0 = No loopback operation is performed
1 = Transmitted frames are looped back internal to the device and TENA remains
inactive (low).
4.1.8 ETHERNET TEST (ETHER_TEST)
The Ethernet Test register controls various manufacturing test modes. Test modes may be
useful to some users, but in general it is not suggested that the user set these modes in
normal operation. This register can only be written when the ETHER_EN bit in the ECNTRL
register is cleared and it is cleared on a reset.
15–8—Reserved.
Must be written to zero by the host processor. These bits are always read as zero.
RNGT—Random number generator test.
This bit allows testing of the random number generation logic used in the transmit backoff
process. To run the random number generator test, write $0080 to this register and then poll
repeatedly. This bit will be changed by hardware from 1 to 0 within 15
sec if the random
number generator is operating properly.
TBO—Test Backoff.
0 = Normal operation of the random number generator logic.
1 = The random number generated by the transmit backoff logic is all ones.
TRND—Transmit random number control.
0 = An internal oscillator clocks the random number generator (normal mode).
1 = The transmit clock is used to generate the Ethernet random number.
SLOT—Slot Time Length.
Specifies the number of bytes in a slot time used in backoff determination.
0 = The number of bytes in a slot time is 64.
1 = The number of bytes in a slot time is 2.
COLL—Force Collision.
COLL allows the collision logic to be tested. The device must be in the internal loopback
mode for COLL to be valid.
0 = No collision is forced.
1 = A collision is forced during the subsequent transmission attempt. This results in 16
total transmission attempts with a retry error reported in the transmit descriptor.
15
14
13
12
11
10
9876543210
00000000
RNGT TBO TRND SLOT COLL DRTY RWS
TWS
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