si2401 Silicon Laboratories, si2401 Datasheet - Page 60
si2401
Manufacturer Part Number
si2401
Description
V.22bis Isomodem With Integrated Global Daa
Manufacturer
Silicon Laboratories
Datasheet
1.SI2401.pdf
(76 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
si2401-F-FS
Manufacturer:
SILICONI/矽睿科技
Quantity:
20 000
Company:
Part Number:
si2401-FS
Manufacturer:
VIMICOR
Quantity:
10
Part Number:
si2401-FS
Manufacturer:
SILICON LABS/芯科
Quantity:
20 000
Company:
Part Number:
si2401-FSR
Manufacturer:
GENNUM
Quantity:
7
Part Number:
si2401-FSR
Manufacturer:
SILICONLABS/芯科
Quantity:
20 000
Si2401
SED (RVC2). Ring Validation Control 2
Reset settings = 0001_1001 (0x19)
60
Bit
7:6
5:0
Name
Type
Bit
Reserved
RAS[5:0]
Name
D7
Read returns zero.
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).
D6
D5
Rev. 1.0
D4
Function
D3
RAS[5:0]
R/W
D2
D1
D0