參數(shù)資料
型號(hào): DS33ZH11
廠(chǎng)商: MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi): 網(wǎng)絡(luò)接口
英文描述: Ethernet Mapper
中文描述: DATACOM, NETWORK INTERFACE SUPPORT CIRCUIT, PBGA100
封裝: 10 X 10 MM, 1.41 MM HEIGHT, 0.80 MM PITCH, CSBGA-100
文件頁(yè)數(shù): 142/169頁(yè)
文件大?。?/td> 1049K
代理商: DS33ZH11
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DS33Z11 Ethernet Mapper
RMII Receive data on RXD[1:0] is expected to be synchronous with the rising edge of the 50 MHz REF_CLK. The
data is only valid if CRS_DV is high. The external PHY asynchronously drives CRS_DV low during carrier loss.
142 of 169
Figure 10-9 RMII Receive Interface Functional Timing
RXD[1:0]
CRS_DV
REFCLK
P
R
E
A
M
B
L
E
F
C
S
10.3 SPI Interface Mode and EEPROM Program Sequence
The DS33Z11 will act as an SPI Master when configured with MODEC[1:0] to read the configuration from an
external Serial EEPROM, such as the Atmel AT25160A. The EEPROM must be programmed with the data
structure shown in
Table 10-1
. The MOSI (Master Out Slave In) signal can be selectively output on the rising or
falling edge of SPICK. The MISO data can be sampled on rising or falling edge of SPICK based on the CKPHA pin
input. The SPICK is generated by the DS33Z11 at a frequency of 8.33 MHz, derived from an external SYSCLKI of
100 MHz. The initialization sequence is commenced immediately after power up reset or a rising edge of the
RST
input pin. The SPI master initiates a read with the instruction code 0000x011b; followed by the address location.
The
SPI_CS
is held low until the data addressed is read and latched. The DS33Z11 begins reading the EEPROM
at address 0000h. Data is sequentially latched until the last data byte is read and latched.
The indirect MAC registers require a special program sequence at the end of the EEPROM file. Four MAC
registers can be programmed in the EEPROM Mode: SU.MACCR, SU.MACMIIA, SU.MACMIID, and
SU.MACFCR. All other indirect MAC registers do not need to be initialized for EEPROM mode operation. The
indirect MAC registers are programmed using four separate seven-byte records from the EEPROM. An example is
shown in
Table 10-2
.
Figure 10-10 SPI Master Functional Timing
MOSI
SPICK
CKPHA=0
0 0 0 0
X
0
1
1
0
0
0
0
0
0
0
7 6 5 4 3 2 1 0
SPI_CS*
0
0
MISO
0
1
2
3
4
5
6
7
8
9
10
11
20
21
22
23
24
25
26
27
28
29
30
31
SPICK
CKPHA=1
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