Feature Comparison: ARM 926, 1136 and Cortex-A8

Key parameters of interest

The following table sumarrizes some of the key differences between the ARM 926, ARM 1136, Cortex-A8 and the Cortex-A9.

	ARM926	ARM1136	Cortex-A8	Cortex-A9
Architecture Version	V5	V6	V7	V7
Pipeline Type	in order,scalar	in order,scalar	in order,dual issue, superscalar	out-of-order, variable length, superscalar
Pipeline Stages	5	8	13	8
ISA Efficiency (DMIPS/MHz)	1.07	1.18	2.01	2.5
MMU	Yes	Yes	Yes	Yes
TLB	8 entry unified	2 uTLB and LB	2x32 full associativity	4 element fully associative + 2x32 two-way associative
Core to L1 Interface	32 bit	64 bit	64 bit -- NEON 128 bit	64 bit -- NEON 128 bit
L1 $ Set associativity	4	4	4	4
Line Length	32 Bytes	32 Bytes	64 Bytes	32 Bytes
Tightly coupled memory	Yes	Yes	No	No
Integrated L2	No	No	Yes	Yes
Cache Model	VIVT	VIPT	L1 - VIPT L2 - PIPT	Instruction - VIPT Data -PIPT
Branch Prediction	No	128 Entry BTB	512 Entry BTB	2 way x 256 BTAC
General Coprocessor Interface	Yes	Yes	No	No
External Interfaces	2 AHB 2.0	5 AHB 2.5 – 3 x 64 bit, 2 x 32 bit	1 AXI – 64/128	2 AXI 64 bit
Trustzone support	No	No	Yes	Yes
Non Cacheable Fill Buffer	4 word	8 word	16 word	2 - 8 word
Java support	Jazelle DBX	Jazelle DBX	Jazelle RCT	Jazelle DBX
Floating Point Media	No (coprocessor available, VFP9)	VFP11 attached, V6 Integer SIMD	VFP Lite and NEON SIMD	VFPv3 and NEON SIMD
Per-Cycle Multiply-accumulate throughput (fixed point)	1 x 32 bit 1 x 16 bit	1 x 32 bit 2 x 16 bit Float: 2 x 32 bit	2 x 32 bit 4 x16 bit 8 x 8 bit	2 x 32 bit 8 x 8 bit