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Hardware Reference Manual 19
Contents
Tables
1 Data Terminology .......................................................................................................................26
2 Longword Formats......................................................................................................................26
3 IXP2800 Network Processor Microengine Bus Arrangement .....................................................35
4 Next Neighbor Write as a Function of CTX_ENABLE[NN_MODE] ............................................38
5 Registers Used By Contexts in Context-Relative Addressing Mode ..........................................41
6 Align Value and Shift Amount .....................................................................................................43
7 Register Contents for Example 10..............................................................................................44
8 Register Contents for Example 11..............................................................................................45
9 RDRAM Sizes.............................................................................................................................50
10 SRAM Controller Configurations.................................................................................................52
11 Total Memory per Channel .........................................................................................................53
12 Address Reference Order...........................................................................................................55
13 Q_array Entry Reference Order..................................................................................................55
14 Ring Full Signal Use – Number of Contexts and Length versus Ring Size ................................58
15 TBUF SPI-4 Control Definition....................................................................................................66
16 TBUF CSIX Control Definition ....................................................................................................67
17 DMA Descriptor Format..............................................................................................................72
18 Doorbell Interrupt Registers........................................................................................................75
19 I/O Latency .................................................................................................................................78
20 Data Cache and Buffer Behavior when X = 0.............................................................................83
21 Data Cache and Buffer Behavior when X = 1.............................................................................83
22 Memory Operations that Impose a Fence ..................................................................................84
23 Valid MMU and Data/Mini-Data Cache Combinations................................................................85
24 Performance Monitoring Events ...............................................................................................107
25 Some Common Uses of the PMU.............................................................................................108
26 Branch Latency Penalty............................................................................................................112
27 Latency Example ......................................................................................................................114
28 Branch Instruction Timings (Predicted by the BTB)..................................................................115
29 Branch Instruction Timings (Not Predicted by the BTB) ...........................................................115
30 Data Processing Instruction Timings ........................................................................................115
31 Multiply Instruction Timings ......................................................................................................116
32 Multiply Implicit Accumulate Instruction Timings ......................................................................117
33 Implicit Accumulator Access Instruction Timings......................................................................117
34 Saturated Data Processing Instruction Timings........................................................................117
35 Status Register Access Instruction Timings .............................................................................118
36 Load and Store Instruction Timings ..........................................................................................118
37 Load and Store Multiple Instruction Timings.............................................................................118
38 Semaphore Instruction Timings ................................................................................................118
39 CP15 Register Access Instruction Timings...............................................................................119
40 CP14 Register Access Instruction Timings...............................................................................119
41 SWI Instruction Timings............................................................................................................119
42 Count Leading Zeros Instruction Timings .................................................................................119
43 Little-Endian Encoding..............................................................................................................120
44 Big-Endian Encoding ................................................................................................................120
45 Byte-Enable Generation by the Intel XScale
®
Core for Byte Transfers in Little- and
Big-Endian Systems .................................................................................................................121
46 Byte-Enable Generation by the Intel XScale
®
Core for 16-Bit Data Transfers in Little-
and Big-Endian Systems ..........................................................................................................123