49.5.4.3.2 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 Grayscale memory mapping configuration for 12-bit data for both formats.

Table 49-8. ISI_CFG2.GS_MODE = 0 (two pixels per word), with ISI_CFG1.GRAYLE = 0
Bit	31	30	29	28	27	26	25	24
	Pixel 0 [11:4]
Bit	23	22	21	20	19	18	17	16
	Pixel 0 [3:0]				–	–	–	–
Bit	15	14	13	12	11	10	9	8
	Pixel 1 [11:4]
Bit	7	6	5	4	3	2	1	0
	Pixel 1 [3:0]				–	–	–	–

Table 49-9. ISI_CFG2.GS_MODE = 0 (two pixels per word), with ISI_CFG1.GRAYLE = 1
Bit	31	30	29	28	27	26	25	24
	Pixel 1 [11:4]
Bit	23	22	21	20	19	18	17	16
	Pixel 1 [3:0]				–	–	–	–
Bit	15	14	13	12	11	10	9	8
	Pixel 0 [11:4]
Bit	7	6	5	4	3	2	1	0
	Pixel 0 [3:0]				–	–	–	–

Table 49-10. ISI_CFG2.GS_MODE = 1 (one pixel per word)
Bit	31	30	29	28	27	26	25	24
	Pixel 0 [11:4]
Bit	23	22	21	20	19	18	17	16
	Pixel 0 [3:0]				–	–	–	–
Bit	15	14	13	12	11	10	9	8
	–	–	–	–	–	–	–	–
Bit	7	6	5	4	3	2	1	0
	–	–	–	–	–	–	–	–

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