36.5.4.3.2 12-bit Grayscale Mode

ISI_DATA[11:0] is the physical interface to the ISI. These bits are sampled and written to memory.

When 12-bit Grayscale mode is enabled, two memory formats are supported:

ISI_CFG2.GS_MODE = 0: two pixels per word

ISI_CFG2.GS_MODE = 1: one pixel per word

The following tables illustrate the memory mapping for the two formats.

If ISI_CFG1.GRAYLE = 0, the pixels map as follows:

Table 36-8. Grayscale Memory Mapping Configuration for 12-bit Data (ISI_CFG2.GS_MODE = 0: two pixels per word)
31	30	29	28	27	26	25	24
Pixel 0 [11:4]

23	22	21	20	19	18	17	16
Pixel 0 [3:0]				–	–	–	–

15	14	13	12	11	10	9	8
Pixel 1 [11:4]

7	6	5	4	3	2	1	0
Pixel 1 [3:0]				–	–	–	–

If ISI_CFG1.GRAYLE=1, the pixels map as follows:

Table 36-9. Grayscale Memory Mapping Configuration for 12-bit Data (ISI_CFG2.GS_MODE = 0: two pixels per word)
31	30	29	28	27	26	25	24
Pixel 1 [11:4]

23	22	21	20	19	18	17	16
Pixel 1 [3:0]				–	–	–	–

15	14	13	12	11	10	9	8
Pixel 0 [11:4]

7	6	5	4	3	2	1	0
Pixel 0 [3:0]				–	–	–	–

Table 36-10. Grayscale Memory Mapping Configuration for 12-bit Data (ISI_CFG2.GS_MODE = 1: one pixel per word)
31	30	29	28	27	26	25	24
Pixel 0 [11:4]

23	22	21	20	19	18	17	16
Pixel 0 [3:0]				–	–	–	–

15	14	13	12	11	10	9	8
–	–	–	–	–	–	–	–

7	6	5	4	3	2	1	0
–	–	–	–	–	–	–	–

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