Intel Intel NetStructure Single Board Computer, MPCBL0010 manual Telecom Clock Register 1 0A09h

MPCBL0010 SBC—Addressing

Table 75.	Telecom Clock Register 1 0A09h
Address	Action	D7	D6	D5	D4	D3	D2	D1	D0
	Read	RSV1	RSV0	SELCLK3B	SELCLK3A	REFSEL	8K_16M	SEL_REFFRQ	SEL_RDNCLK
0xA09	Write	NU	NU	SELCLK3B	SELCLK3A	NU	8K_16M	SEL_REFFRQ	SEL_RDNCLK
	Reset	X	X	0	0	X	0	0	0

SELCLK3B: Select the clock to send to the backplane CLK3B:

0:from the first AdvancedMC (AMC B1, CLKC)

1:from the second AdvancedMC (AMC B2, CLKC).

SELCLK3A: Select clock to send to backplane CLK3A:

0:from the first AdvancedMC (AMC B1, CLKC)

1:from the second AdvancedMC (AMC B2, CLKC).

8K_16M: This bit is valid only when the transmission clock is selected by setting TXREFx_SEL[2..0]=101 in TelClock3 register. Setting this bit selects the transmission clock frequency as 16.384 MHz, while clearing it select 8.0 kHz.

SEL_REFFRQ: Select reference frequency (8 k or 19.44 M): 0 = 8 kHz, 1=19.44 MHz. This bit controls the multiplexer that feeds clocks to the PLL:

0:PLL input clocks = CLK1A & CLK1B (8kHz per AdvancedTCA spec)

1:PLL input clocks = CLK2A & CLK2B (19.44MHz per AdvancedTCA spec)

SEL_RDNCLK: Setting this bit to the value of the formerly read REFSEL enables the switch-over to the actual unused reference in the case of LOS of the actual reference.

REFSEL: Show the reference that is currently selected:

0:Primary reference

1:Secondary reference

RSV1/ RSV0: Reserved.

Table 76.	Telecom Clock Register 2 0A0Ah
	Address	Action	D7	D6	D5	D4	D3	D2	D1	D0
		Read	PRI_LOS	SEC_LOS	HOLDOVER	UNLOCK	NU	DRVCLKA1	NU	DRVCLKA0
	0xA0A	Write	NU	NU	NU	NU	NU	DRVCLKA1	NU	DRVCLKA0
		Reset	X	X	X	X	X	0	X	0

PRI_LOS: Loss of primary reference clock detected. This bit is high when the primary clock at the input of the PLL (i.e., after PLD mux) is lost.

SEC_LOS: Loss of secondary reference clock detected. This bit is high when the primary clock at the input of the PLL (i.e. after PLD mux) is lost.

HOLDOVER: Holdover detected by the PLL

UNLOCK: Unlock detected by the PLL

Intel NetStructure® MPCBL0010 Single Board Computer
Technical Product Specification	October 2006
100	Order Number: 304120