參數(shù)資料
型號: EWIXP455ABT
廠商: INTEL CORP
元件分類: 微控制器/微處理器
英文描述: 266 MHz, RISC PROCESSOR, PBGA544
封裝: LEAD FREE, PLASTIC, BGA-544
文件頁數(shù): 108/163頁
文件大?。?/td> 1123K
代理商: EWIXP455ABT
Package Information
May 2005
Intel IXP45X and Intel IXP46X Product Line of Network Processors Datasheet
49
Document Number: 306261-002
DDRI_CKE[1:0]
Z
b’00
VO
O
Clock enables — One clock after DDRI_CKE[1:0] is de-asserted, data is latched on DQ[31:0]
and DDRI_CB[7:0]. Burst counters within DDR SDRAM device are not incremented. De-
asserting this signal places the DDR SDRAM in self-refresh mode. For normal operation,
DDRI_CKE[1:0] must be asserted.
DDRI_RCVENOUT_N
Z
1
VO
O
RECEIVE ENABLE OUT must be connected to DDRI_RCVENIN_N signal of the IXP45X/
IXP46X network processors and the propagation delay of the trace length must be matched to
the clock trace plus the average DQ Traces.
DDRI_RCVENIN_N
Z
VI
I
RECEIVE ENABLE IN provides delay information for enabling the input receivers and must be
connected to the DDRI_RCVENOUT_N signal of the IXP45X/IXP46X network processors.
DDRI_RCOMP
Tied off
to a
resistor
Tied off
to a
resistor
Tied off to
a resistor
Tied off to
a resistor
O
20 Ohm 1% tolerance Resistor connected to ground used for process/temperature
adjustments.
DDRI_VREF
VCCM/
2
VCCM/2
I
DDR SDRAM Voltage Reference — is used to supply the reference voltage to the differential
inputs of the memory controller pins.
Table 11.
DDR SDRAM Interface (Sheet 2 of 2)
Name
Power
on
Reset
Normal
After
Reset
Until
Software
Enables
Normal
After
Software
Enables
Type
Description
NOTE:
This table discusses all features supported on the Intel IXP45X and Intel IXP46X Product Line of Network Processors. For details on feature support listed by
processor, see Table 1 on page 14.
For a legend of the Type codes, see Table 10 on page 46.
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