参数资料
型号: MC68302FC20CR2
厂商: FREESCALE SEMICONDUCTOR 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, PQFP132
封装: 0.950 X 0.950 INCH, 0.025 INCH PITCH, PLASTIC, QFP-132
文件页数: 112/128页
文件大小: 641K
代理商: MC68302FC20CR2
Applications
MOTOROLA
MC68EN302 REFERENCE MANUAL
6-5
6.2.7 RET_Cnt:
The RC field in the transmit buffer descriptor is the retry count (bits 5-2 of the most significant
long word). If the RL bit is also set (bit 6) then the RC bits have no meaning since the retry
limit has been exceeded.
6.2.8 MFLR:
The maximum frame length is set in MC68EN302 hardware to 1518.
6.2.9 MINFLR:
The minimum frame length is set in MC68EN302 hardware to 64.
6.2.10 MAXD1, MAXD2:
These operations are covered by the maximum frame length being automatically set at 1518
bytes. This is not programmable in the MC68EN302.
6.2.11 MAX_b:
The MC68EN302 supports buffer descriptor options ranging from 8 Tx and 120 RX buffer
descriptors to 64 TX and 64 RX buffer descriptors.
6.2.12 GADDR1-4 / PADDR_HML / IADDR1-4:
AR_CNTL provides the address filtering. Options in the MC68EN302 are either 64 perfect
address matches or 62 perfect address matches with address filtering via a hash routine.
6.2.13 P_PER:
The persistance is not programmable on the MC68EN302 but rather is a specific value set
in the MC68EN302 hardware.
6.2.14 RFBD_ptr/TFBD_ptr/TLBD_ptr:
Buffer descriptors in the MC68EN302 are placed at MOBAR+$C00 through MOBAR+$FFF.
The TFBD_ptr is always at MOBAR+$C00.
The TLBD_ptr can range from MOBAR+$C00 in a one buffer frame to MOBAR+$DFF in a
64 transmit buffer frame.
The RFBD_ptr is either at MOBAR+$C40, MOBAR+$C80, MOBAR+$D00 or
MOBAR+$E00 depending on the setting of the BDSIZE bits.
6.2.15 TX_len:
The TX frame length counter is part of the data length field in the buffer descriptor. To come
up with the total tx frame length the user must keep track of the data length in the buffer
descriptors belonging to that frame.
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