Datasheet

____________________________________________________ DS34S101, DS34S102, DS34S104, DS34S108
Rev: 032609 183 of 198
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 DS34S10x 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 through a serial termination
resistor.
When connecting the device to a 64 Mb external SDRAM, it is advised to connect SD_A[11] through 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.