Datasheet

____________________________________________________ DS34T101, DS34T102, DS34T104, DS34T108
349 of 366
15.5 Working in SPI Mode
The following table shows the I/O connections for operating in SPI mode.
Table 15-1. SPI Mode I/O Connections
Signal name Connect to Comments
H_CPU_SPI_N VSS (logic 0) Selects SPI mode.
DAT_32_16_N DVDDIO or DVSS Ignored in SPI mode.
H_CS_N DVDDIO or DVSS Ignored in SPI mode.
H_AD[24:1] DVDDIO or DVSS Ignored in SPI mode.
H_D[31:1] DVDDIO or DVSS Ignored in SPI mode.
H_D[0] / SPI_MISO Master MISO
H_WR_BE0_N / SPI_CLK Master SPI clock
H_WR_BE1_N / SPI_MOSI Master MOSI
H_WR_BE2_N / SPI_SEL_N Master SPI select
H_WR_BE3_N / SPI_CI DVDDIO (logic 1) or DVSS (logic 0) According to required SPI mode
H_R_W_N / SPI_CP DVDDIO (logic 1) or DVSS (logic 0) According to required SPI mode
15.6 Connecting SDRAM Devices
The following table lists suggested SDRAM devices to use in conjunction with the DS34T10x devices.
Table 15-2. List of Suggested SDRAM Devices
Vendor 64 Mb Device 128 Mb Device
Micron MT48LC2M32B2TG-6 MT48LC4M32B2TG-6
Samsung K4S643232H-TC/L60 K4S283232E-TC/L60
Hynix HY57V653220BTC-6 or
HY57V643220CT-6
HY57V283220T-6
Elpida N/A EDS1232AATA-60
Winbond W986432DH-6 N/A
ICSI IC42S32200/L-6T or
IC42S32200/L-6TI
N/A
ISSI IS42S32200C1-6T IS42S32400B-6T
When connecting the device to an external SDRAM, it is advised to connect SD_CLK th
rough a serial termination
resistor.
When connecting the device to a 64 Mb external SDRAM, it is advised to connect SD_A[11] throu
gh a serial
resistor to the SDRAM “NC” pin that is used for address pin A11 for a 128 Mb SDRAM. In this way, the 64Mb
SDRAM could be replaced by a 128 Mb SDRAM later, if needed.