SuperH (SH) 64-bit RISC Series SH-5 System Architecture, Volume ...

PRELIMINARY DATA
182 Matching on devices with wide address ranges
2.3 Matching on devices with wide address
ranges
Some SuperHyway devices (for example, the external memory interface (EMI)) have
address ranges that occupy more than one value in the most significant byte. When
programming a bus analyzer channel to match accesses to such a device, the
programming must be as though multiple devices are being matched, one per value
of the highest byte. The following paragraphs give some examples.
• If the desired address range is [0x81001000, 0x81002000], this can be
programmed by setting the address start and end registers to 0x1000 and
0x2000 respectively, and the source/destination device value and mask to match
precisely the value 0x81.
• If the desired address range is [0x80000000, 0x81FFFFF8], this can be
programmed by setting the address start and end registers to 0x0 and
0xFFFFF8 respectively, and the source/destination device value and mask to
match the values 0x80 and 0x81 (that is, with a wildcard LSB).
• If the desired address range consists of the 2 subranges [0x80000000,
0x807FFFF8] and [0x810000000, 0x817FFFF8], this can be programmed by
setting the address start and end registers to 0x0 and 0x7FFFF8 respectively,
and the source/destination device value and mask to match the values 0x80 and
0x81 (that is, with a wildcard LSB).
• It is not possible to match a range like [0x80800000, 0x817FFFF8]. This would
require the end address to be set less than the start address, so no address would
match for both address comparators.
D R A FT
SuperH, Inc.
SH-5 System Architecture, Volume 3: Debug 05-SA-10003 v1.0