NXP Semiconductors KL25 Series - BDT Page Register 1 (Usbx_Bdtpage1)

35.4.16 BDT Page Register 1 (USBx_BDTPAGE1)
Provides address bits 15 through 9 of the base address where the current Buffer
Descriptor Table (BDT) resides in system memory. The 32-bit BDT Base Address is
always aligned on 512-byte boundaries, so bits 8 through 0 of the base address are always
zero.
Address: 4007_2000h base + 9Ch offset = 4007_209Ch
Bit 7 6 5 4 3 2 1 0
Read
BDTBA
0
Write
Reset
0 0 0 0 0 0 0 0
USBx_BDTPAGE1 field descriptions
Field Description
7–1
BDTBA
Provides address bits 15 through 9 of the BDT base address.
0
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
35.4.17 Frame Number Register Low (USBx_FRMNUML)
Contains an 11-bit value used to compute the address where the current Buffer Descriptor
Table (BDT) resides in system memory.
Address: 4007_2000h base + A0h offset = 4007_20A0h
Bit 7 6 5 4 3 2 1 0
Read
FRM[7:0]
Write
Reset
0 0 0 0 0 0 0 0
USBx_FRMNUML field descriptions
Field Description
7–0
FRM[7:0]
This 8-bit field and the 3-bit field in the Frame Number Register High are used to compute the address
where the current Buffer Descriptor Table (BDT) resides in system memory.
Memory map/Register definitions
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
636 Freescale Semiconductor, Inc.