Broadcom BCM1250 User Manual page 330

BCM1250/BCM1125/BCM1125H
Bits Name
8:6 tx_pause_cnt
16:9 reserved
17 ap_stat_en
18 reserved
19 drp_errpkt_en
20 drp_fcserrpkt_en
21 drp_codeerrpkt_en
22 drp_drblerrpkt_en
23 drp_rntpkt_en
24 drp_oszpkt_en
25 drp_lenerrpkt_en
31:26 reserved
Page 302 Section 9: Ethernet MACs
Table 176: MAC Configuration Registers
mac_cfg_0 - 00_1006_4100
mac_cfg_1 - 00_1006_5100
mac_cfg_2 - 00_1006_6100
This register is used in both Ethernet and Packet FIFO modes
Default
3'b0 Transmit pause count. This field sets the number of slot times pause that will be
requested when the interface transmits a pause frame. It is also used to initialize
the local pause counter which indicates when the next flow control packet needs
to be sent. The encodings are:
000: 512
001: 1K
010: 2K
011: 4K
100: 8K
101: 16K
110: 32K
111: 64K
Used in Ethernet mode only.
8'b0 Reserved
1'b0 Append packet status enable. When this bit is set the packet status is written to
the receive FIFO following the last entry in the packet. This bit should be set for
Ethernet mode and clear for Packet FIFO mode.
Used in Ethernet and Packet FIFO modes.
1'b0 Reserved
1'b0 If this bit is set then automatic dropping is enabled for all error packets (bits [31:26]
are ignored).
Used in Ethernet mode only.
1'b0 If this bit is set then packets with an FCS (CRC) error are automatically dropped.
Used in Ethernet mode only.
1'b0 If this bit is set then packets that are signalled with a code error by the PHY are
automatically dropped.
Used in Ethernet mode only.
1'b0 If this bit is set then packets with a dribble error are automatically dropped.
Used in Ethernet mode only.
1'b0 If this bit is set then runt packets (those shorter than the minimum packet size
configured in the mac_frame_cfg register) are automatically dropped.
Used in Ethernet mode only.
1'b0 If this bit is set then oversize packets (those longer than the maximum packet size
configured in the mac_frame_cfg register are automatically dropped. (Unless a
non-standard protocol is used the maximum packet size will always be larger than
the receive FIFO, so this is not likely to happen in practice.)
Used in Ethernet mode only.
1'b0 If this bit is set then packets with a length error are automatically dropped. A length
error is signalled when the length/type field of the packet is less than or equal to
1500 (indicating it is being used as the length) and its value does not match the
packet length.
Used in Ethernet mode only.
6'b0 Reserved
B r oadco m C orp or ati on
(Cont.)
Description
Document 1250_1125-UM100CB-R
User Manual
10/21/02