參數(shù)資料
型號: E-110
廠商: LSI Corporation
英文描述: 100BASE-T Fast Ethernet Core(100BASE-T快速以太網(wǎng)處理芯片 Fast Ethernet Core)
中文描述: 100兆- T的快速以太網(wǎng)核心(100兆- T的快速以太網(wǎng)處理芯片快速以太網(wǎng)核心)
文件頁數(shù): 59/130頁
文件大小: 770K
代理商: E-110
MAC Core Signals
2-27
a new transmit statistics vector. When deasserted, it indi-
cates that there has been no update.
2.1.7 Random Number Generator to Host Signals
Below is a list of the signals that interface the E-110 MAC random
number generator function to the host. All signals are active HIGH unless
otherwise noted. Signal direction is with respect to the random number
generator.
HWD[10:0]
Host Write Data [10:0]
The HWD[10:0] signals contain the value of the random
number that the host loads into the MAC’s Linear Feed-
back Shift Register (LFSR) to generate the random num-
ber sequence used in collision backoff timing. HWD[10:0]
must remain stable for two MTXC cycles after LRNG is
asserted.
Input
LRNG
Load Random Number Generator
The host asserts the LRNG signal to indicate that the
HWD[10:0] signals are valid and the MAC function should
latch them. When the host deasserts LRNG, the
HWD[10:0] signals are not valid. LRNG must be synchro-
nous to the MTXC clock and at least one MTXC clock
cycle wide, which is 40 ns for 100-MHz operation and
400 ns for 10-MHz operation (see the description of the
MTXC signal on page 2-13). The HWD[10:0] signals must
be stable when the host pulses LRNG.
Input
2.1.8 Scan Test Signals
The MAC design uses full scan test methodology, which consists of a
single scan chain and appropriate scan signals. The scan signals are
described below.
TMODE
Test Mode
When the TMODE signal is asserted, the MAC switches
to test mode. When TMODE is deasserted, the MAC
resumes normal functional operation.
Input
TEST_SE
Scan Enable
When the TEST_SE signal is asserted, all of the registers
in the MAC accept data from their test inputs instead of
from their normal inputs. When TEST_SE is asserted, the
Input
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