Cypress manual HTC7, HTC2, DA6 DA5 DA4 DA3 DA2 DA1 DA0, DA7, SL811HS Control Registers

SL811HS

USB-A/USB-B Host Transfer Count Register (Read), USB Address (Write) [Address = 04h, 0Ch]. This register has two different functions depending on whether it is read or written. When read, this register contains the number of bytes remaining (from Host Base Length value) after a packet is transferred. For example, if the Base Length register is set to 0x040 and an IN Token was sent to the peripheral device. If, after the transfer is complete, the value of the Host Transfer Count is 0x10, the number of bytes actually transferred is 0x30. This is considered as an underflow indication.

Table 8. USB-A / USB-B Host Transfer Count Register when READ [Address 04h,						0Ch]
Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit	2	Bit 1	Bit 0
HTC7	HTC6	HTC5	HTC4	HTC3	HTC2		HTC1	HTC0

When written, this register contains the USB Device Address with which the Host communicates.

Table 9. USB-A / USB-B USB Address when WRITTEN [Address 04h, 0Ch]

Bit 7	Bit 6	Bit 5	Bit 4	Bit3	Bit 2	Bit 1	Bit 0
0	DA6	DA5	DA4	DA3	DA2	DA1	DA0
DA6-DA0	Device address, up to 127 devices can be addressed.
DA7	Reserved bit must be set to zero.

SL811HS Control Registers

The next set of registers are the Control registers and control more of the operation of the chip instead of USB packet type of transfers. Table 10 is a summary of the control registers.

Table 10. SL811HS Control Registers Summary

Register Name SL811H	SL811HS (hex) Address
Control Register 1	05h
Interrupt Enable Register	06h
Reserved Register	07h
Status Register	0Dh
SOF Counter LOW (Write)/HW Revision Register (Read)	0Eh
SOF Counter HIGH and Control Register 2	0Fh
Memory Buffer	10h-FFh

Document 38-08008 Rev. *D Page 7 of 32