Table 8-1 shows operating the TLC6984 in stackable mode.

Figure 8-2 shows that device 2 must be rotated 180^o relative to device 1. This action allows the position of line switches to be near the center column of the LED matrix for better routing. For device 1, the lines are connected sequentially (line switch 0 connected to scan line 1). However on device 2, it is connected in reverse order, with the 16^th scan line is connected to line switch 15 and the 32^th scan line is connected to line switch 0.

Figure 8-2 shows the connection between two TLC6984 devices in stackable mode driving a 32 × 32 RGB LED pixels. The MOD_SIZE must be configured to 001b. Device1 supplies 16 line switches for the first 16 scan line, and device 2 supplies 16 line switches for scan line 17-32. The data for matrix sections A and C are stored in device 1, while matrix sections B and D data are stored in device 2.

To make sure the scanning sequence is still from 1^st line to 32^nd line, the scan line switching order of the second device must be reversed, This configuration can be completed by the SCAN_REV (see FC4 for more details).

Figure 8-2 Mode2 Diagram

Figure 8-3 Mode3 and Mode4 Diagram

Figure 8-4 Mode5 and Mode6 Diagram

Figure 8-5 Mode7 and Mode8 Diagram

When two TLC6984 devices are used in stackable mode, if there are unused line switches, these unused line switches must be the last line switches of the first or the second device. For example, if there are only 30 scanning lines, and if,

SCAN_REV = '0'b, the unused line switches can be either of below,

• 1_LS14, 1_LS15
• 2_LS14, 2_LS15

SCAN_REV = '1'b, the unused line switches can be either of below,

• 1_LS14, 1_LS15
• 2_LS1, 2_LS0

If the unused line switches are 1_LS14, 1_LS15, the FC6-FC13 registers must be configured. If the unused line switches are 2_LS14, 2_LS15 when SCAN_REV = '0' or 2_LS1, 2_LS0 when SCAN_REV = '1', there is no need to configure FC6-FC13 registers.