TNETX3150 datasheet(83/113 Pages) TI1

83 / 113 page

TNETX3150/TNETX3150A

ThunderSWITCH™ 15-PORT 10-/100-MBIT/S ETHERNET™ SWITCH

SPWS027F – FEBRUARY 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

glossary (continued)

TX data errors

This statistic is switchable between:

The number of transmit frames discarded on transmission due to lack of resources (i.e., the transmit queue

is full). This allows queue monitoring for dynamic queue sizing and buffer allocation.

The number of data errors at transmission. This is incremented when a mismatch is seen between a

received good CRC and a checked CRC at transmission or when a partial frame is transmitted due to a

receive underrun.

The function this counter performs is selected by the STMAP bit (bit 3) of the system control register.

TX H/W errors

The function of this counter is performed by the TX data errors counter.

TX octets

This contains a count of data and padding octets of frames that were successfully transmitted. See

IEEE Std 802.3 Supplements, Layer Management (section 5) 5.2.2.1.1, number 5.

unallocated memory

Due to the memory configuration, an additional 16 words of memory are created. Address 0x980–0x9FF are

reserved.

undersize RX frames

The total number of packets received that were less than 64 octets long (excluding framing bits, but including

FCS octets) and were otherwise well formed.

TNETX3150 数据表(PDF) 83 Page - Texas Instruments