Hardware¶

Physical Setup / Board Stacking¶

The hardware consists of two circuit boards:

• Top board: AC/DC power supply and Ethernet switch
• Bottom board: Actual Femtocell mainboard

The two boards are sandwiched together by the following connections:

• 6-pin fine-pitch connector (most likely for DC power)
• flexible printed circuit cable (most likely for Ethernet MII/RMII)
• two large sheet metal parts for ground and/or thermal connection

It is thus not very straight forward to operate the opened device in a safe way (i.e. without live AC line voltage present).

We will be working on a way to operate it with injected safe low DC voltage, but that is still TBD.

Major Components¶

Femtocell SoC (U3)¶

Broadcomm BCM61610KFB1G (formerly Percello)

• no information found anywhere
• probably derivative of PRC6100
  • http://www.node-h.com/en/news/article/Node-H_3GPP_Iu-h_Femtocell_Software_is_Standards_Compliant.php
  • https://www.s3group.com/semiconductor-solutions/s3-percello-collaborate-produce-latest-femtocell-baseband-processor/
• probably derivative of PRC6000
  • https://www.bdti.com/InsideDSP/2008/10/15/Percello
• contains MIPS24Kc core

NAND Flash (U40)¶

Hynix H27U1G8F2BTR

• 1Gbit (128MByte) NAND Flash, x8 data bus, 3.3V, 2k page size, 128k erase block, 48pin TSOP1
• http://natisbad.org/NAS/refs/Hynix_NAND_128Mo_H27U1G8F2BT.pdf

RF Transceiver¶

Maxim MAX2550

• Band I, V, and VIII WCDMA Femtocell Transceiver with GSM Monitoring
• https://www.maximintegrated.com/en/products/comms/wireless-rf/MAX2550.html
• https://datasheets.maximintegrated.com/en/ds/MAX2550.pdf
• https://www.maximintegrated.com/en/app-notes/index.mvp/id/5364

Ethernet Switch¶

Atheros AR8236-AL1A

• 6-port Fast Ethernet Switch
• https://wikidevi.com/files/Atheros/specsheets/AR8326.pdf
• http://jhongtech.com/DOWN/ATHEROS--AR8236.pdf

AC/DC switching power supply controller¶

• https://www.power.com/sites/default/files/product-docs/linkcv_family_datasheet.pdf

RF LDO (WU1)¶

• AP2318 Adjustable ULDO in DFN3x3-8
  • https://www.diodes.com/assets/Datasheets/AP2318.pdf

Connectors¶

Mainboard J2¶

• 12pos 2x6 1.27mm pitch header
• unpopulated
• likely (MIPS) JTAG and/or console

Pin	Function
1	GND
2	3V3
3
4
5
6
7
8
9	UART_TXD
10
11
12

Mainboard J3¶

• 30pos 0.5mm pitch FPC
• connects to PSU Board CON1
• likely LED + AR8236 (R)MII + AR8236 SPI + AR8236 UART

Mainboard J4¶

• 3pos 2.54mm pitch hader, center pos missing
• used to supply 230V AC from mainboard to PSU board
• connects to PSU Board J4

Mainboard J5¶

• 8pos 2x4 1.27mm pitch SMD header
• DC power input
• connects to PSU-Board J

Pin	Function
1	4V DC (supply for LDOs on mainboard)
2	4V DC (supply for LDOs on mainboard)
3	GND
4	GND
5	GND
6	GND
7	3.3V DC (regulated on PSU board for Ethernet Switch)
8	3.3V DC (regulated on PSU board for Ethernet Switch)

PSU-Board U9¶

Yellow RJ45 mag-jack, connected to Port 0 of AR8236

PSU-Board U8¶

Grey RJ45 mag-jack, connected to Port 3 of AR8236