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BCM88335 Datasheet(PDF) 61 Page - Cypress Semiconductor |
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BCM88335 Datasheet(HTML) 61 Page - Cypress Semiconductor |
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61 / 140 page  Generic SPI Mode BCM88335 Data Sheet BROADCOM CONFIDENTIAL Broadcom® September 23, 2015 • 88335-DS100-R Page 60 Command Structure The gSPI command structure is 32 bits. The bit positions and definitions are as shown in Figure 23. Figure 23: gSPI Command Structure Write The host puts the first bit of the data onto the bus half a clock-cycle before the first active edge following the CS going low. The following bits are clocked out on the falling edge of the gSPI clock. The device samples the data on the active edge. Write/Read The host reads on the rising edge of the clock requiring data from the device to be made available before the first rising clock edge of the clock burst for the data. The last clock edge of the fixed delay word can be used to represent the first bit of the following data word. This allows data to be ready for the first clock edge without relying on asynchronous delays. Read The read command always follows a separate write to set up the WLAN device for a read. This command differs from the write/read command in the following respects: a) chip selects go high between the command/address and the data and b) the time interval between the command/address is not fixed. 0 10 27 11 P a cket length - 11b its * Ad dres s – 17 bits F1 F 0 C A F unction N o: 00 – F unc 0 01 – F unc 1 10 – F unc 2 11 – F unc 3 C ommand : 0 – R ead 1 – W rite 28 29 30 31 A cce ss : 0 – F ixed add ress 1 – Incremental add res s * 11’ h0 = 204 8 by tes 0 10 27 11 P a cket length - 11b its * Ad dres s – 17 bits F1 F 0 C A F unction N o: 00 – F unc 01 – F unc 1: Registers and meories belonging to other blocks in the chip (64 bytes max) 10 – F unc 2: DMA channel 1. WLAN packets up to 2048 bytes. 11 – F unc C ommand : 0 – R ead 1 – W rite 28 29 30 31 A cce ss : 0 – F ixed add ress 1 – Incremental add res s * 11’ h0 = 204 8 by tes BCM_SPID Command Structure |
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