RPIXP2800BC Intel, RPIXP2800BC Datasheet - Page 142
RPIXP2800BC
Manufacturer Part Number
RPIXP2800BC
Description
Manufacturer
Intel
Datasheet
1.RPIXP2800BC.pdf
(154 pages)
Specifications of RPIXP2800BC
Operating Supply Voltage (typ)
1.3/1.5/2.5/3.3V
Operating Supply Voltage (max)
1.575/2.7/3.465V
Operating Supply Voltage (min)
1.235/2.3/3.135V
Mounting
Surface Mount
Operating Temperature (max)
70C
Operating Temperature (min)
0C
Operating Temperature Classification
Commercial
Lead Free Status / Rohs Status
Not Compliant
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IXP28XX Network Processor
Slowport
7.1.2.2.4
Figure 87.
142
Note: The IXP28XX CSR Receive Enable Register (SP_RXE) can be used to advance the data sampled
Read Transactions
As with the write operations, the read transactions to 16- and 32-bit devices will need to be
unpacked: eight bits per cycle prior to the data being sent back to the IXP28XX network processor
via the SP_AD bus. Again, the SP_CP, SP_OE_L, and SP_DIR signals implement the control logic
needed to perform the unpacking of the read data. This example also highlights the logic required
for Mode 3.
The glue logic is responsible for latching the 32-bit read data coming from the downstream device
on the rising edge of the read signal or as specified by the device.
Slowport interface signals presented to the glue logic during a read transaction.
internally before the rising edge of the SP_CLK. For programming SP_RXE, refer to the Intel®
IXP2400 and IXP2800 Network Processor Programmer’s Reference Manual.
example of a Slowport Mode 3 Read with RXE = 2.
Mode 32-Bit Read Transfer
SP_CS_L[1:0]
SP_AD[7:0]
SP_ACK_L
SP_ALE_L
SP_WR_L
SP_OE_L
SP_RD_L
SP_CLK
SP_DIR
SP_CP
28
3
14
0
1
0
Figure 87
Hardware Design Guide
3
shows the timing of the
Figure 88
is an
B0601-01
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