參數(shù)資料
型號: C3ENPB0-DS
英文描述: 4 Mbit (512 Kbit x 8) ZEROPOWER® SRAM
中文描述: ? - 3E的網絡處理器的數(shù)據(jù)資料硅修訂買0
文件頁數(shù): 44/114頁
文件大?。?/td> 1893K
代理商: C3ENPB0-DS
44
CHAPTER 2: SIGNAL DESCRIPTIONS
C3ENPA1-DS/D REV 03
MOTOROLA GENERAL BUSINESS INFORMATION
Serial Interface Signals
The Serial interface is a bidirectional two-wire serial bus. It can use one of the following
formats:
An 8bit data format followed by an acknowledge bit, which supports transfers at up to
400kbps (low speed).
a 16bit IEEE 802.3 MDIO data format with 10bits of addressing, which supports
transfers up to 25MHz (high speed).
The signals and pins are identical for both the high and low speed protocols.
Which of the two data rates used is selected by the state of the PROM interface
s SPLD
signal that is asserted while the PROM interface is idle. When SPLD is asserted
HI
the low
speed serial bus protocol is selected and when SPLD is asserted
LOW
the MDIO protocol is
selected.
The bus only supports a single master hierarchy that can operate as either a receiver or a
transmitter.
Both SIDA and SICL are bidirectional lines that are connected, through a pull-up resistor,
to a positive supply voltage. When the bus is free, both lines are HIGH. The output stages
of the devices connected to the bus must have either an open-drain or open-collector in
order to perform the wired-AND function required for its arbitration mechanism.
PGNTX
AA8
1
I
PD
PCI
I
Initiator bus grant (arbitration)
PIDSEL
AA5
1
I
Initialization device select
PINTA
AC1
1
PCI
O
Interrupt
TOTAL PINS
50
Table 15
PCI Signals (continued)
SIGNAL NAME
PIN #
TOTAL
TYPE
I/O
SIGNAL DESCRIPTION
Table 16
Serial Interface Signals
SIGNAL NAME
PIN #
TOTAL
TYPE
I/O
SIGNAL DESCRIPTION
SICL
AA1
1
LVTTL
I
PD
/O Serial Clock line
I
PD
/O Serial Data line
SIDA
AA4
1
LVTTL
TOTAL PINS
2
F
n
.
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