Cypress CYS25G0101DX-ATC manual Led

				CYS25G0101DX-ATC Evaluation Board User’s Guide
		Table 4. Functional Description of DIP Switch 1 (SW1) (continued)
Position	Name		State		Description
5	LOOPTIME		ON		The transmission will be using the extracted receive bit-clock for the
					transmitted bit clock
			OFF*		ThetransmissionwillbeusingtheREFCLKinput(155.52MHz),which
					is multiplied by 16, to generate the transmitted bit clock
6	LOCKREF		ON*		The receive PLL locks to serial data stream
			OFF		The receive PLL locks to the REFCLK
7	PWRDN		ON*		Disable Power Down - Normal Operation
			OFF		Enable Device Power Down mode. All the logic and drivers are dis-
					abledandplacedintoastandbyconditionwhereonlyminimalpoweris
					dissipated
8	FIFO_RST		ON*		Disable FIFO reset - Normal Operation
			OFF		Reset the transmit FIFO pointers. The in and out pointers of the trans-
					mit FIFO are reset to the maximum separation

		Table 5. Functional Description of J4 Connector
Pin	Name		Description
1A, 1B, 3A, 3B	VCC_OPTIC		Power supply for optical module
2A, 2B, 4A, 4B	GND		Power ground
5A	NC		No Connection
5B	SD		SD signal from optical module

Table 6. Description of LED Indicators

LED	Name	LED Status	Description
D1	FIFO_ERR	ON	The transmit FIFO has either under or overflowed. The FIFO
			must be reset to clear the error (by switching the DIP switch
			SW1-8 to OFF and then ON. See Table 4 for details)
		OFF	Indicates the FIFO has neither under or overflowed
D2	LFI	ON	Indicates no Line Fault. It will appear to be ON even when LFI is
			toggling. In such a case observe LFI using a scope on J7
		OFF	Indicatestheselectedreceivedatastreamhasbeen detected an
			invalid either LOW input on SD or by the receive VCO being oper-
			ated outside its specified limits

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