GS6150 Datasheet, PDF (28/64 Pages) Gennum Corporation – Automatic or Manual Rate Selection

Table 4-4: GPIO Status Outputs
GPIO[0:3]_SELECT
Parameter
0000
LOS
0001
LOCKED
0010
0101
0110
0111
1000
LBR_HBR
RATE_DET0
RATE_DET1
RATE_DET2
LOCKED_125M
1001
LOCKED_270M
1010
LOCKED_1G485
1011
LOCKED_2G97
1100
LOCKED_5G94
1101
RATE_CHANGE
Description
Loss of signal indication - High when there is no detected
signal on the selected DDI input
Phase lock indication - High when the CDR has phase-
locked to a valid input signal
Low bit-rate/High bit-rate - High when the part is locked to
the SD data rate; low for all other data rates and in bypass.
Rate Detect - Three bits used in conjunction that represent
the data rate detected by the rate search state machine.
Refer to Table 4-2 for rate encoding details.
High when the rate search state machine is locked to a
MADI data rate (125Mb/s)
High when the rate search state machine is locked to an SD
data rate (270Mb/s)
High when the rate search state machine is locked to an HD
data rate (1.485Gb/s)
High when the rate search state machine is locked to a 3G
data rate (2.97Gb/s)
High when the rate search state machine is locked to a 6G
data rate (5.94Gb/s)
When a change in the data rate is detected by the rate
search state machine, the RATE_CHANGE signal is pulsed
high for a duration of 37ns
The signals that can be input on the GPIOs are listed in Table 4-5 below.
Table 4-5: GPIO Signal Inputs
GPIO[0:3]_SELECT
0000
0001
Parameter
DDO0_DISABLE
DDO1_DISABLE
Description
Disables serial data output 0 (DDO0, DDO0)
Disables serial data output 1 (DDO1, DDO1)
By default, the GPIO pins are configured to the following parameters:
GPIO0: LOS (output)
GPIO1: LOCKED (output)
GPIO2: LBR_HBR (output)
GPIO3: DDO1_DISABLE (input)
GS6150
Final Data Sheet
PDS-060127
Rev.2
March 2015
www.semtech.com
28 of 64
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