參數(shù)資料
型號: SI2401FS08-EVB
廠商: Silicon Laboratories Inc
文件頁數(shù): 57/76頁
文件大小: 0K
描述: BOARD EVAL SI2401 + SI3008
標(biāo)準(zhǔn)包裝: 1
系列: ISOmodem®
主要目的: 電信,數(shù)據(jù)采集裝置(DAA)
已用 IC / 零件: SI2401
已供物品: 板,CD
Si2401
60
Rev. 1.0
Reset settings = 0001_1001 (0x19)
SED (RVC2). Ring Validation Control 2
Bit
D7
D6
D5D4D3D2
D1
D0
Name
RAS[5:0]
Type
R/W
Bit
Name
Function
7:6
Reserved
Read returns zero.
5:0
RAS[5:0]
Ring Assertion Time.
These bits set the minimum ring frequency for a valid ring signal. During ring qualification,
a timer is loaded with the RAS[5:0] field upon a TIP/RING event and decrements at a reg-
ular rate. If a second or subsequent TIP/RING event occurs after the timer has timed out,
the frequency of the ring is too low, and the ring is invalidated. The difference between
RAS[5:0] and RMX[5:0] identifies the minimum duration between TIP/RING events to qual-
ify as a ring, in binary-coded increments of 2.0 ms (nominal). A TIP/RING event typically
occurs twice per ring tone period. At 20 Hz, TIP/RING events would occur every
1/(2 x 20 Hz) = 25 ms. To calculate the correct RAS[5:0] value for a frequency range
[f_min, f_max], the following equation should be used: RAS[5:0] = 1 / (2 x f_min).
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