cx28250 Mindspeed Technologies, cx28250 Datasheet - Page 23

• Manufacturer Part Number: cx28250
• Description: Cx28250 Atm Physical Interface Phy Devices
• Manufacturer: Mindspeed Technologies

CX28250
ATM Physical Interface (PHY) Devices
Table 1-1. CX28250 Pin Definitions (1 of 12)
28250-DSH-002-C
Reset*
OneSecIn
OneSecOut
TxFrameRef
RxFrameRef
8kHzIn
LTxPFN
LTxPFP
LRxPFN
LRxPFP
Pin Label
Device Reset
One-Second Strobe
One-Second Output
Transmit Frame Clock
Receive Frame Clock
8 kHz Reference
Clock Input
Transmit PLL Filter
Negative Input
Transmit PLL Filter
Positive Input
Receive PLL Filter
Negative Input
Receive PLL Filter
Positive Input
Signal Name
label indicates that the pin logic level is active low.
Pin names and numbers are listed in
Mindspeed Technologies
No.
L10
P11
M3
M2
M6
N1
N2
P2
N3
L6
Type
TTL
TTL
TTL
TTL
TTL
TTL
—
—
—
—
I/O
O
O
O
I
I
I
I
I
I
I
This pin is used to reset the device when asserted
low.
This input is used to latch device status, typically at
1-second intervals.
This pin is a 1-second count derived from the 8kHzIn
input.
This pin can be either an 8 kHz output derived from
the Transmit SONET/SDH frame or a 19.44 MHz
output derived from the transmit clock, as selected by
bit 1 of the TXSEC (0x0C) register.
The output of this pin is either an 8 KHz or 19.44 MHz
reference derived from the recovered clock. The
frequency is determined by bit 1 in the RXSEC
register.
During a LOS condition the newest versions of the
CX28250, (-26 and above), automatically derive this
output from the LPLLClk input until the recovered
clock is available.
This pin is an 8 kHz clock input used to derive
OneSecOut.
This pin connects to the RC filter as shown in
Figure
This pin connects to the RC filter as shown in
Figure
This pin connects to the RC filter as shown in
Figure
This pin connects to the RC filter as shown in
Figure
Table
™
2-5.
2-5.
2-5.
2-5.
1.4 CX28250 Pinout and Pin Descriptions
1-1. An asterisk (*) following a pin
Description
1.0 Product Description
1-7