Intel NETWORK PROCESSOR IXP2800 - Manual (Page 154)

154 Hardware Reference Manual
Intel
®
IXP2800 Network Processor
Intel XScale ® Core
16-Bit Microprocessor Read Interface Protocol
Figure 44 , likewise depicts a single read transaction launched from the IXP2800 Network
Processor to the Lucent* TDAT042G5 device followed by a single read transaction. However, in
this case the read timing control register has to be programmed to setup=0, pulse width=7, and
hold =0.
In Figure 44 , we can count twelve clock cycles used for the read transaction in total, (i.e., 240 ns)
for a clock cycle of 10 ns, excluding a turnaround cycle after that. It has the throughput of 7.7
Mbytes per second.
Figure 44. Mode 1 Single Read Transfer for Lucent* TDAT042G5 Device (B0)
B1746-04
SP_CLK
SP_ALE_L
SP_CS_L[1] /CS#
SP_WR_L/ADS#
SP_RD_L/R/W#
2
T0 T1 T2 T3 T4 T5 T6 T7
0 4 6 8 10 12 14 16 18 20 22 24
SP_AD[7:0]
SP_ACK_L /DT#
SP_CP
SP_OE_L
D[15:0]
A[23:0] A[23:0]
SP_DIR
ADDR[15:0]
DATA[15:0]
A
[15:0]
A
[15:8]
A
[7:0]
A
[23:16]
A
[15:8]
A
[7:0]
A
[23:16]
D
[7:0] D[15:8] D[7:0] D[7:0]
D[15:0] 2x[15:8] D[7:0]
A
[15:0]
A
[7:0]
A
[7:0]
D[15:0]