Maxim DS33R11 specifications GL.SDMODE2, Gl.Sdmodews, Gl.Sdrftc

DS33R11 Ethernet Mapper with Integrated T1/E1/J1 Transceiver

Register Name:			GL.SDMODE2
Register Description:			Global SDRAM Mode Register 2
Register Address:			3Bh
Bit #	7	6	5		4	3
Name	-	-		-	-	-
Default	0	0		0	0	0

2	1	0
LTMOD2	LTMOD1	LTMOD0
0	1	0

Bits 0 - 2: CAS Latency Mode (LTMOD0 - LTMOD2) These bits are used to setup CAS Latency

Note: Only CAS Latency of 2 or 3 is allowed

Note: This register has a nonzero default value. This should be taken into consideration when initializing the device.

Note: After changing the value of this register, the user must toggle the GL.SDMODEWS.SDMW bit to write the new values to the SDRAM.

Register Name:			GL.SDMODEWS
Register Description:			Global SDRAM Mode Register Write Status
Register Address:			3Ch
Bit #	7	6	5		4	3	2	1	0
Name	-	-		-	-	-	-	-	SDMW
Default	0	0		0	0	0	0	0	0

Bit 0: SDRAM Mode Write (SDMW) Setting this bit to 1 will write the current values of the mode control and refresh time control registers to the SDRAM. The user must clear this bit and set it again for subsequent write operations.

Register Name:		GL.SDRFTC
Register Description		Global SDRAM Refresh Time Control
Register Address:		3Dh
Bit #	7	6	5	4	3
Name	SREFT7	SREFT6	SREFT5	SREFT4	SREFT3
Default	0	1	0	0	0

2	1	0
SREFT2	SREFT1	SREFT0
1	1	0

Bits 0 - 7: SDRAM Refresh Time Control (SREFT0 – SREFT7) These 8 bits are used to control the SDRAM refresh frequency. The refresh rate will be equal to this register value x 8 x 100MHz.

Note: This register has a nonzero default value. This should be taken into consideration when initializing the device.

Note: After changing the value of this register, the user must toggle the GL.SDMODEWS.SDMW bit to write the new values to the SDRAM.

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