ST STM32L4+ Series Reference Manual page 459

RM0432
Example of calculation
We are considering the following configuration for virtual buffer 0
•
First visible block of line 0: block 7
•
Number of visible block in line 0: 10
•
First visible block of line 1: block 6
•
Number of visible block in line 1: 12
•
Address of the physical buffer: 0xC020:0000
The configuration shall be:
•
The base address of the physical buffer 0: 0xC000:0000
•
The offset of buffer 0: 0x20:0000
•
First visible block of line 0: block 7
•
Last visible block of line 0: block 16
•
Block 0 offset of line 0: (0 - 7) x 0x10 = -0x70 = 0x3F:FF90
•
First visible block of line 1: block 6
•
Last visible block of line 1: block 17
•
Block 0 offset of line 1: (10 - 6) x 0x10 = (0xA - 0x6) x 0x10 = 0x40
As a consequence:
•
the physical address of block 7 of line 0 is:
0xC000:0000 + 0x20:0000 + (0x3F:FF90 + 0x70 without carry) = 0xC020:0000
•
the physical address of block 16 of line 0 is:
0xC000:0000 + 0x20:0000 + (0x3F:FF90 + 0x100 without carry) = 0xC020:0090
•
the physical address of block 6 of line 1 is:
0xC000:0000 + 0x20:0000 + (0x40 + 0x60 without carry) = 0xC020:00A0
• the physical address of block 17 of line 1 is:
0xC000:0000 + 0x20:0000 + (0x40 + 0x110 without carry) = 0xC020:0150
RM0432 Rev 6
Chrom-GRC™ (GFXMMU)
459/2301
467