USB on-the-go full-speed (OTG_FS) RM0351
1518/1693 DocID024597 Rev 3
43.14 OTG_FS control and status registers
By reading from and writing to the control and status registers (CSRs) through the AHB
slave interface, the application controls the OTG_FS controller. These registers are 32 bits
wide, and the addresses are 32-bit block aligned. The OTG_FS registers must be accessed
by words (32 bits).
CSRs are classified as follows:
• Core global registers
• Host-mode registers
• Host global registers
• Host port CSRs
• Host channel-specific registers
• Device-mode registers
• Device global registers
• Device endpoint-specific registers
• Power and clock-gating registers
• Data FIFO (DFIFO) access registers
Only the Core global, Power and clock-gating, Data FIFO access, and host port control and
status registers can be accessed in both host and device modes. When the OTG_FS
controller is operating in one mode, either device or host, the application must not access
registers from the other mode. If an illegal access occurs, a mode mismatch interrupt is
generated and reflected in the Core interrupt register (MMIS bit in the OTG_GINTSTS
register). When the core switches from one mode to the other, the registers in the new mode
of operation must be reprogrammed as they would be after a power-on reset.
43.14.1 CSR memory map
The host and device mode registers occupy different addresses. All registers are
implemented in the AHB clock domain.
Global CSR map
These registers are available in both host and device modes.
Table 256. Core global control and status registers (CSRs)
Acronym
Address
offset
Register name
OTG_GOTGCTL 0x000 OTG control and status register (OTG_GOTGCTL) on page 1522
OTG_GOTGINT 0x004 OTG interrupt register (OTG_GOTGINT) on page 1524
OTG_GAHBCFG 0x008 OTG AHB configuration register (OTG_GAHBCFG) on page 1526
OTG_GUSBCFG 0x00C OTG USB configuration register (OTG_GUSBCFG) on page 1526
OTG_GRSTCTL 0x010 OTG reset register (OTG_GRSTCTL) on page 1528
OTG_GINTSTS 0x014 OTG core interrupt register (OTG_GINTSTS) on page 1530
OTG_GINTMSK 0x018 OTG interrupt mask register (OTG_GINTMSK) on page 1534
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